562:(ACBL) tournaments, support doubles must be indicated on the convention card and must be Alerted. Additionally, when opener makes a call other than a support double (including Pass) when the support double is an option, an Alert should be made if the partnership agreement is that opener's failure to double or to raise denies three-card or longer support for responder's suit (normally, one would expect only four-card or longer support to be denied by failure to raise responder's major suit). Per the "Alert Procedures" page on the ACBL website: "In general, when the use of conventions leads to unexpected understandings about suit length by negative inference, a natural call becomes Alertable." While the ACBL does make an exception for agreements that "have become expected and are fairly common," the fact that the ACBL continues to require an Alert for the support double itself argues against applying this exception; the requirement to Alert implies that the support double is not considered "expected... and fairly common" to date.
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which does not play as well as eight-card fits. Since the need to distinguish between three- and four-card support occurs more frequently than those cases where the opening bidder would like to make a penalty double over the opponent's one-level overcall, the meaning of the double (and redouble) was
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Playing negative doubles or not, opener's double shows three spades. It is irrelevant that opener knows that partner has five spades (if playing negative doubles), the double shows three-card support. The principle is that you and your partner use the opponent's bidding to assist your bidding.
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The convention came as result of the scenario where in competitive auctions, the opening bidder would like to show his minimal three-card support for partner's suit on the possibility that partner has five or more cards in it. However, there would be a risk of a 4-3 fit, known as a
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Without knowing RHO's next bid, if East knows there is a nine-card spade fit, East can bid 4 Spades even in an IMP game and expect a good chance to make it. However think about the same auction if partner doubles showing exactly three spades, your bid now becomes a guess.
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The assumption is that the overcaller must surely have at least five cards in the suit he has bid. As such a simple raise is normally sufficient to show some points and support. In such a situation, a double by the partner of the overcaller would be treated as either a
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The above examples show the support double's use over one-level overcalls. Partnerships usually decide to play support doubles through 2 Hearts or 2 Spades. Here are several other less discussed examples but nonetheless valid examples of normal support doubles
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of two in partner's suit indicates four-card support and a call of double promises three-card support; if partner's suit bid is doubled instead of overcalled, a redouble serves the same meaning as double. The convention was invented by
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There is a lot of literature for advancing players on the importance of determining eight- versus nine-card fits. Here is one example of its importance: As East, your hand is xxxxx, xx, void, KQxxxx The auction is
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used to distinguish between three-card and four-card support for partner's suit response to one's opening bid in the scenario where his response is either overcalled or doubled by the opponents. A
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call. This is important because South might only have four hearts. Based on the South no trump bid, it can be assumed that South doesn't have five or more hearts.
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Rodwell, Eric. NewInBridge - The Topics
Collection; Topic 00 - Support Doubles and Redoubles. First published September 15, 2010; revised September 1, 2012.
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Hand in hand with the support double is the support redouble which also shows three card support. Examine this auction, which is similar to the one above.
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The double is still support. It is particularly important in this instance. BTW: The most likely culprit is South.
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West has opened and his partner has shown five clubs and 10 points yet South is showing a limit raise of Hearts.
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Clarify right now if you have three- or four-card support unless you have something else very important to say.
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A support redouble applies when Right Hand
Opponent makes a take-out double of the response of one of a major: 1
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North has shown three-card support for South's heart suit. South uses this information to form the next bid.
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In this case with a really competitive auction, someone is probably stretching their bid.
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Support doubles are not used (except by special agreement) by partner of an overcaller.
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Playing support doubles, North, the opener, has shown three-card support for South's 1
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modified to convey the conventional meaning of three-card support.
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List of bridge people with
Knowledge (XXG) (English) articles
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American
Contract Bridge League, "Alert Procedures".
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565:Most bridge clubs require a partnership to employ
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2232:World Transnational Open Teams Championship
92:Pass or other bids: fewer than three spades
66:Pass or other bids: fewer than three hearts
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2268:European Universities Bridge Championships
2132:Bridge at the 2012 World Mind Sports Games
2127:Bridge at the 2008 World Mind Sports Games
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2106:List of bridge competitions and awards
1707:List of nationality transfers in sport
2596:25 Bridge Conventions You Should Know
2477:Sternberg Women's Board-a-Match Teams
2042:International Mind Sports Association
56:Double shows three-card heart support
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2280:North American bridge Championships:
2631:The Official Encyclopedia of Bridge
2427:North American Bridge Championships
2638:Planning the Play of a Bridge Hand
2342:Keohane North American Swiss Teams
82:Redouble: three-card spade support
14:
2669:List of contract bridge magazines
974:Optimum contract and par contract
770:Glossary of contract bridge terms
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2467:Smith Life Master Women's Pairs
2222:World Senior Teams Championship
2217:World Senior Pairs Championship
2192:World Junior Teams Championship
2187:World Junior Pairs Championship
2062:United States Bridge Federation
2057:South African Bridge Federation
1992:American Contract Bridge League
1528:Non-simultaneous double squeeze
560:American Contract Bridge League
2497:Von Zedtwitz Life Master Pairs
2362:Manfield Non-Life Master Pairs
2352:Leventritt Silver Ribbon Pairs
2292:Edgar Kaplan Blue Ribbon Pairs
2237:World Women Pairs Championship
2207:World Mixed Teams Championship
2202:World Mixed Pairs Championship
1702:List of contract bridge people
1310:Principle of restricted choice
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2617:Contract Bridge for Beginners
2556:List of contract bridge books
2212:World Open Pairs Championship
1894:List of bridge administrators
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89:shows four-card spade support
63:shows four-card heart support
2502:Wagar Women's Knockout Teams
2387:Mitchell Board-a-Match Teams
2287:ACBL King or Queen of Bridge
2182:World IMP Pairs Championship
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475:Importance of nine-card fits
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112:Take the following auction:
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2417:Non-Life Master Swiss Teams
2397:Nail Life Master Open Pairs
2357:Machlin Women's Swiss Teams
2302:Chicago Mixed Board-a-Match
2052:Norwegian Bridge Federation
2037:Hungarian Bridge Federation
2002:Brazilian Bridge Federation
1987:American Bridge Association
1553:Simultaneous double squeeze
1211:List of bidding conventions
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2583:Terence Reese bibliography
2539:Publications and resources
2177:World Bridge Championships
2017:Canadian Bridge Federation
2007:Bridge Federation of India
1997:Austrian Bridge Federation
780:History of contract bridge
755:Duplicate bridge movements
2573:Edwin Kantar bibliography
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2422:Norman Kay Platinum Pairs
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1697:ACBL Youngest Life Master
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1004:Quantitative notrump bids
994:Principle of fast arrival
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2603:Bridge Squeezes Complete
2578:Hugh Kelsey bibliography
2307:Fall National Open Pairs
1680:People and organizations
785:Laws of Duplicate Bridge
2512:Whitehead Women's Pairs
2337:Jacoby Open Swiss Teams
2197:World Mind Sports Games
2067:World Bridge Federation
2022:Dutch Bridge Federation
1956:Galatasaray Bridge Team
1250:List of play techniques
1085:List of bidding systems
745:Contract bridge diagram
2645:Right Through the Pack
2377:Mini-Blue Ribbon Pairs
2162:Triple crown of bridge
2137:Cavendish Invitational
2032:European Bridge League
1966:Portland Club (London)
1899:List of bridge writers
1568:Stepping-stone squeeze
1513:Entry-shifting squeeze
1150:Kaplan–Sheinwold
1054:Useful space principle
2457:Senior Knockout Teams
2452:Roth Open Swiss Teams
2012:British Bridge League
1145:Highly unusual method
1120:Bridge World Standard
2652:Tickets to the Devil
2447:Rockwell Mixed Pairs
2432:North American Pairs
2402:National 199er Pairs
2332:Hilliard Mixed Pairs
2327:Grand National Teams
2157:Senior Bowl (bridge)
2027:English Bridge Union
1961:Melville Bridge Club
989:Prepared opening bid
40:For example, after 1
2713:Grand Slam (BBC TV)
2517:Young LM–1500 Pairs
2412:National 99er Pairs
2407:National 49er Pairs
2297:Bruce LM–5000 Pairs
2227:World Team Olympiad
1712:Bridge Headquarters
1558:Single-suit squeeze
1533:Progressive squeeze
1498:Criss-cross squeeze
954:Law of total tricks
825:Traveling scoreslip
2758:Bridge conventions
2624:Design for Bidding
2561:Master Point Press
2507:Wernher Open Pairs
2462:Silodor Open Pairs
2246:National and Zonal
1941:Bridge Base Online
1721:Players by country
1600:Suit combinations:
1449:Morton's fork coup
1195:Strong club system
1014:Sacrifice (bridge)
959:Losing-Trick Count
879:Balancing (bridge)
815:Singaporean bridge
725:Cheating in bridge
705:Bridge Murder case
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2273:Gold Cup (bridge)
2142:Computer Olympiad
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1115:Bridge Base Basic
1019:Shooting (bridge)
944:Honor point count
899:Bridge convention
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1478:Backwash squeeze
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1170:Precision Club
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1142:
1137:
1132:
1127:
1122:
1117:
1112:
1107:
1102:
1100:Bidding system
1097:
1092:
1087:
1081:
1079:
1075:
1074:
1072:
1071:
1066:
1061:
1056:
1051:
1046:
1041:
1039:Takeout double
1036:
1031:
1026:
1021:
1016:
1011:
1006:
1001:
996:
991:
986:
981:
976:
971:
966:
961:
956:
951:
946:
941:
936:
931:
926:
921:
916:
911:
906:
901:
896:
894:Board (bridge)
891:
889:Bidding system
886:
881:
876:
870:
868:
860:
859:
856:
849:
848:
845:
844:
841:
840:
838:
837:
832:
827:
822:
817:
812:
807:
802:
797:
792:
787:
782:
777:
772:
767:
762:
757:
752:
747:
742:
737:
732:
727:
722:
717:
712:
710:Bridge scoring
707:
702:
697:
692:
687:
685:Auction bridge
681:
679:
671:
670:
667:
660:
659:
654:
652:
651:
644:
637:
629:
621:
620:
609:
599:
598:
596:
593:
592:
591:
589:Takeout double
586:
581:
574:
571:
555:
552:
545:
544:
542:
540:
538:
531:
530:
524:
518:
512:
505:
504:
499:
494:
489:
476:
473:
461:
460:
458:
456:
452:
451:
445:
439:
433:
426:
425:
420:
415:
410:
396:
395:
393:
391:
388:
381:
380:
374:
368:
362:
358:
357:
352:
347:
342:
329:
326:
311:
310:
307:
301:
295:
288:
287:
282:
277:
272:
260:
257:
251:
250:
248:
245:
241:
240:
234:
231:
225:
221:
220:
215:
210:
205:
185:
184:
182:
180:
178:
174:
173:
170:
167:
164:
157:
156:
150:
147:
141:
137:
136:
131:
126:
121:
109:
106:
94:
93:
90:
83:
68:
67:
64:
57:
22:support double
18:Contact bridge
13:
10:
9:
6:
4:
3:
2:
2770:
2759:
2756:
2755:
2753:
2730:
2727:
2726:
2724:
2720:
2714:
2711:
2710:
2708:
2704:
2698:
2697:
2693:
2691:
2690:
2686:
2684:
2683:
2679:
2672:
2670:
2667:
2666:
2664:
2660:
2654:
2653:
2649:
2647:
2646:
2642:
2640:
2639:
2635:
2633:
2632:
2628:
2626:
2625:
2621:
2619:
2618:
2614:
2612:
2611:
2607:
2605:
2604:
2600:
2598:
2597:
2593:
2586:
2584:
2581:
2579:
2576:
2574:
2571:
2564:
2562:
2559:
2557:
2554:
2553:
2551:
2547:
2543:
2536:
2532:
2518:
2515:
2513:
2510:
2508:
2505:
2503:
2500:
2498:
2495:
2493:
2490:
2488:
2485:
2483:
2480:
2478:
2475:
2473:
2470:
2468:
2465:
2463:
2460:
2458:
2455:
2453:
2450:
2448:
2445:
2443:
2440:
2438:
2435:
2433:
2430:
2428:
2425:
2423:
2420:
2418:
2415:
2413:
2410:
2408:
2405:
2403:
2400:
2398:
2395:
2393:
2390:
2388:
2385:
2383:
2382:Mini-Spingold
2380:
2378:
2375:
2373:
2370:
2368:
2365:
2363:
2360:
2358:
2355:
2353:
2350:
2348:
2345:
2343:
2340:
2338:
2335:
2333:
2330:
2328:
2325:
2323:
2320:
2318:
2315:
2313:
2310:
2308:
2305:
2303:
2300:
2298:
2295:
2293:
2290:
2288:
2285:
2283:
2276:
2274:
2271:
2269:
2266:
2264:
2261:
2259:
2256:
2254:
2251:
2250:
2248:
2244:
2238:
2235:
2233:
2230:
2228:
2225:
2223:
2220:
2218:
2215:
2213:
2210:
2208:
2205:
2203:
2200:
2198:
2195:
2193:
2190:
2188:
2185:
2183:
2180:
2178:
2175:
2173:
2170:
2168:
2165:
2163:
2160:
2158:
2155:
2153:
2152:Rosenblum Cup
2150:
2148:
2147:McConnell Cup
2145:
2143:
2140:
2138:
2135:
2133:
2130:
2128:
2125:
2123:
2120:
2119:
2117:
2113:
2107:
2104:
2103:
2101:
2097:
2093:
2089:Championships
2086:
2082:
2068:
2065:
2063:
2060:
2058:
2055:
2053:
2050:
2048:
2045:
2043:
2040:
2038:
2035:
2033:
2030:
2028:
2025:
2023:
2020:
2018:
2015:
2013:
2010:
2008:
2005:
2003:
2000:
1998:
1995:
1993:
1990:
1988:
1985:
1984:
1982:
1978:
1972:
1969:
1967:
1964:
1962:
1959:
1957:
1954:
1952:
1949:
1947:
1944:
1942:
1939:
1938:
1936:
1932:
1926:
1923:
1921:
1918:
1916:
1913:
1912:
1910:
1906:
1900:
1897:
1895:
1892:
1890:
1887:
1886:
1884:
1880:
1874:
1873:United States
1871:
1869:
1866:
1864:
1861:
1859:
1856:
1854:
1851:
1849:
1846:
1844:
1841:
1839:
1836:
1834:
1831:
1829:
1826:
1824:
1821:
1819:
1816:
1814:
1811:
1809:
1806:
1804:
1801:
1799:
1796:
1794:
1791:
1789:
1786:
1784:
1781:
1779:
1776:
1774:
1771:
1769:
1766:
1764:
1761:
1759:
1756:
1754:
1751:
1749:
1746:
1744:
1741:
1739:
1736:
1734:
1731:
1729:
1726:
1725:
1723:
1719:
1713:
1710:
1708:
1705:
1703:
1700:
1698:
1695:
1694:
1692:
1688:
1684:
1677:
1673:
1659:
1656:
1654:
1651:
1649:
1648:Rusinow leads
1646:
1644:
1641:
1639:
1638:Rule of 10-12
1636:
1634:
1631:
1629:
1626:
1624:
1621:
1620:
1618:
1616:Defender play
1614:
1608:
1605:
1603:
1596:
1594:
1591:
1589:
1586:
1584:
1583:Trump squeeze
1581:
1579:
1576:
1574:
1573:Strip squeeze
1571:
1569:
1566:
1564:
1561:
1559:
1556:
1554:
1551:
1549:
1546:
1544:
1541:
1539:
1536:
1534:
1531:
1529:
1526:
1524:
1521:
1519:
1518:Guard squeeze
1516:
1514:
1511:
1509:
1508:Entry squeeze
1506:
1504:
1501:
1499:
1496:
1494:
1491:
1489:
1488:Clash squeeze
1486:
1484:
1481:
1479:
1476:
1474:
1467:
1465:
1462:
1460:
1457:
1455:
1454:Scissors coup
1452:
1450:
1447:
1445:
1444:Merrimac coup
1442:
1440:
1437:
1435:
1432:
1430:
1427:
1425:
1422:
1420:
1417:
1415:
1412:
1410:
1407:
1405:
1402:
1400:
1399:Alcatraz coup
1397:
1395:
1388:
1386:
1383:
1381:
1378:
1376:
1369:
1368:
1366:
1364:Declarer play
1362:
1356:
1355:Vacant Places
1353:
1351:
1348:
1346:
1343:
1341:
1338:
1336:
1333:
1331:
1328:
1326:
1323:
1321:
1318:
1316:
1315:Probabilities
1313:
1311:
1308:
1306:
1303:
1301:
1298:
1296:
1293:
1291:
1288:
1286:
1283:
1281:
1278:
1276:
1273:
1271:
1268:
1266:
1263:
1261:
1258:
1256:
1253:
1251:
1248:
1247:
1245:
1241:
1237:
1230:
1226:
1212:
1209:
1208:
1206:
1202:
1196:
1193:
1191:
1188:
1186:
1183:
1181:
1178:
1176:
1173:
1171:
1168:
1166:
1163:
1161:
1158:
1156:
1153:
1151:
1148:
1146:
1143:
1141:
1138:
1136:
1133:
1131:
1128:
1126:
1123:
1121:
1118:
1116:
1113:
1111:
1108:
1106:
1103:
1101:
1098:
1096:
1093:
1091:
1088:
1086:
1083:
1082:
1080:
1076:
1070:
1067:
1065:
1062:
1060:
1057:
1055:
1052:
1050:
1047:
1045:
1042:
1040:
1037:
1035:
1032:
1030:
1027:
1025:
1024:Single suiter
1022:
1020:
1017:
1015:
1012:
1010:
1007:
1005:
1002:
1000:
997:
995:
992:
990:
987:
985:
982:
980:
977:
975:
972:
970:
967:
965:
962:
960:
957:
955:
952:
950:
947:
945:
942:
940:
937:
935:
932:
930:
927:
925:
922:
920:
917:
915:
912:
910:
907:
905:
904:Brown sticker
902:
900:
897:
895:
892:
890:
887:
885:
882:
880:
877:
875:
874:Balanced hand
872:
871:
869:
865:
861:
854:
850:
836:
833:
831:
828:
826:
823:
821:
818:
816:
813:
811:
808:
806:
805:Rubber bridge
803:
801:
798:
796:
793:
791:
788:
786:
783:
781:
778:
776:
773:
771:
768:
766:
763:
761:
758:
756:
753:
751:
748:
746:
743:
741:
738:
736:
733:
731:
728:
726:
723:
721:
718:
716:
713:
711:
708:
706:
703:
701:
700:Bridge maxims
698:
696:
695:Bridge-O-Rama
693:
691:
690:Bridge ethics
688:
686:
683:
682:
680:
676:
672:
665:
661:
657:
650:
645:
643:
638:
636:
631:
630:
627:
618:
613:
610:
604:
601:
594:
590:
587:
585:
582:
580:
577:
576:
572:
570:
568:
567:active ethics
563:
561:
553:
551:
543:
541:
539:
533:
525:
519:
513:
507:
503:
498:
493:
488:
484:
481:
474:
472:
469:
466:
459:
457:
454:
446:
440:
434:
428:
424:
419:
414:
409:
405:
402:
394:
392:
389:
383:
375:
369:
363:
360:
356:
351:
346:
341:
337:
334:
328:At what level
327:
325:
323:
319:
308:
302:
296:
290:
286:
281:
276:
271:
267:
264:
258:
256:
249:
246:
243:
235:
232:
226:
223:
219:
214:
209:
204:
200:
197:
194:
183:
181:
179:
176:
171:
168:
165:
159:
151:
148:
142:
139:
135:
130:
125:
120:
116:
113:
107:
105:
102:
101:
91:
84:
81:
80:
79:
65:
58:
55:
54:
53:
38:
36:
31:
27:
23:
19:
2706:TV and Radio
2694:
2687:
2680:
2673:
2650:
2643:
2636:
2629:
2622:
2615:
2608:
2601:
2594:
2587:
2565:
2322:Goren Trophy
2277:
2122:Bermuda Bowl
1658:Smith signal
1633:Opening lead
1597:
1588:Vice squeeze
1563:Squeeze play
1468:
1434:Devil's coup
1389:
1370:
1335:Smother play
1305:Pin (bridge)
1270:Card reading
1185:Säffle Spade
1180:Romex system
1155:Little Major
1064:Weak two bid
1059:Void (cards)
1044:Three suiter
929:Forcing pass
790:Masterpoints
715:Bridge whist
612:
603:
564:
557:
548:
501:
496:
491:
486:
478:
470:
467:
464:
422:
417:
412:
407:
399:
354:
349:
344:
339:
331:
314:
284:
279:
274:
269:
262:
254:
217:
212:
207:
202:
195:
188:
133:
128:
123:
118:
111:
98:
95:
74:- (Pass) - 1
69:
44:- (Pass) - 1
39:
35:Eric Rodwell
21:
15:
2253:Buffett Cup
1951:Crockford's
1920:Dallas Aces
1882:Other lists
1863:Switzerland
1833:New Zealand
1768:Netherlands
1464:Vienna coup
1385:Safety play
1204:Conventions
1165:Polish Club
1130:Carrot Club
1110:Boring Club
1034:Strong pass
999:Psychic bid
924:Forcing bid
884:Bidding box
100:Moysian fit
78:- (Double)
37:in 1974.
2676:Magazines:
2367:Marcus Cup
2167:Venice Cup
1971:Savoy Club
1643:Rule of 11
1459:Trump coup
1175:Roman Club
1069:Zar Points
1049:Two suiter
1029:Stolen bid
969:Minor suit
964:Major suit
795:Minibridge
595:References
554:ACBL rules
259:Exceptions
2662:Magazines
2442:Reisinger
1925:Four Aces
1915:Blue Team
1728:Australia
1471:Squeezes:
1404:Bath coup
1260:Beer card
1233:Card play
1105:Blue Club
720:Bridgette
2752:Category
2472:Spingold
1843:Pakistan
1748:Bulgaria
1350:Uppercut
1330:Shooting
1140:Fantunes
979:Overcall
934:Game try
668:Overview
573:See also
2099:General
1808:Ireland
1798:Hungary
1793:Germany
1783:Fiction
1778:England
1763:Denmark
1743:Britain
1733:Austria
1690:General
1380:Finesse
1295:Hold up
1280:Endplay
1243:General
1160:Moscito
1078:Systems
984:Preempt
914:Cue bid
867:General
857:Bidding
835:Vugraph
765:Goulash
730:Chicago
678:General
2590:Books:
1868:Taiwan
1858:Sweden
1853:Russia
1848:Poland
1838:Norway
1828:Monaco
1823:Mexico
1813:Israel
1788:France
1753:Canada
1738:Brazil
1653:Signal
1392:Coups:
1373:Basic:
1320:Revoke
810:Screen
492:North
413:North
345:North
275:North
208:North
124:North
20:, the
2549:Books
2115:World
1934:Clubs
1908:Teams
1818:Italy
1803:India
1773:Egypt
1758:China
1340:Tempo
1285:Entry
1265:Caddy
830:Trump
502:South
497:East
487:West
423:South
418:East
408:West
355:South
350:East
340:West
285:South
280:East
270:West
218:South
213:East
203:West
134:South
129:East
119:West
108:Usage
24:is a
1414:Coup
1325:Ruff
1275:Duck
1135:EHAA
1095:Acol
820:Suit
361:Pass
320:, a
309:Dbl
247:Rdbl
233:Pass
224:Pass
177:Pass
172:1NT
169:Pass
149:Pass
140:Pass
48:- (1
30:call
558:In
455:Dbl
390:Dbl
244:Dbl
166:Dbl
16:In
2754::
534:2
526:2
520:1
514:1
447:2
435:1
384:2
370:1
52:)
648:e
641:t
634:v
536:♠
528:♥
522:♠
516:♥
510:♣
508:1
449:♦
443:♣
441:2
437:♥
431:♦
429:1
386:♥
378:♠
376:1
372:♥
366:♣
364:1
305:♣
303:2
299:♠
297:1
293:♦
291:1
238:♥
236:1
229:♣
227:1
191:♥
162:♠
160:1
154:♥
152:1
145:♣
143:1
87:♠
85:2
76:♠
72:♦
61:♥
59:2
50:♠
46:♥
42:♦
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.