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Fischer random chess numbering scheme

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1927:
random number generator could make one probe into the range at hand for a random number, and produce a random SP. Late in 2005, the program Fritz9 became available. It has a Fischer random chess option, but, for some unexplained reason, it assigns idns to SPs in a different way. Rather than requiring a giant table with 960 entries, both methods can use some smaller tables and some arithmetic.
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number and select that matching bishops' positioning from the Bishop's Table. According to this first place both bishops at the first base row, then the six pieces in the sequence of the found row of the King's Table upon the six free places left over. Finally the black pieces will be placed symmetrically to White's base row.
2002:
For any SP, after ignoring the bishops, attention is given first to the knights (rather than to the queen). After taking account of the arrangement of the two knights in six squares (skipping over bishops), the queen is left with four possibilities: 0,1,2,3 (counting from the a-side of the board and
1998:
Upon entry to Fischer random chess, Fritz9 prompts the user to enter a position idn or to "draw lots". If the user wishes to choose the first rank configuration of pieces, he/she must know how to get at the idn, but, unfortunately, Fritz9 does not use the standard method described above. The table
1938:
For any SP, both the queens position and the N5N configuration are immediately available from the NQ-skeleton. The queen's position is the number of characters to the left of the "Q", giving 2 for the standard SP. The N5N configuration is obtained by omitting the "Q", giving -N-N- for the standard
1989:
In any SP, when looking at the arrangement of the other pieces around the bishops, it is helpful to write down the NQ-skeleton for that SP. This is done by ignoring the bishops and replacing the "K" and "R" by a common symbol, say "-". The NQ-skeleton for the standard SP is -NQ-N-. The sections
1972:
Going the other way, given an idn, locate, in the table, the largest number, say M, that is less than or equal to idn. Then idn - M gives the bishop's code, and the skeleton at M shows how to fill in the rest of the pieces. Given idn = 518 we locate 512, with NQ-skeleton -NQ-N-, in the table, and
1930:
The methods described below are appropriate for the idn range 0-959. For the idn range 1-960, he recommends conversion by dividing by 960 and working with the remainder. This has the effect of assigning to idn 0 the SP that was at idn 960, and leaving the other idn SP matchups unchanged. If this
1917:
Consider the SP-518 arrangement. The largest multiple of 16 less than 518 is 512, so we search for 512 in the King's table and the remainder, 6, in the Bishop's table. In the King's table, number 512 is "RNQKNR". In the Bishop's table, "--B--B--" is at number 6. We insert the pieces from the King's
1968:
Given an SP, extract the bishop's code, the NQ-skeleton and its N5N configuration. The six skeletons in each of the 10 blocks in the table all have the same N5N configuration, and the blocks are arranged according to the N5N table above. It is easy, then, to find the appropriate block, and look
1934:
For any SP, after skipping over the bishop's, the queen may occupy any one of six possible squares, and they are numbered from left to right (from White's perspective) 0,1,2,3,4,5. The two knights, then, can appear in any of the remaining five squares (skipping over bishops and queen) in 10 ways.
1981:
Both methods take account of the positions of the bishops first, and ignore the distinction between the king and rooks. Once the positions of the bishops, knights and queen are known, there is only one possibility for the remaining three squares. In the places where division of whole numbers is
1913:
These two tables will serve for a quick mapping of an arbitrary Fischer random chess starting position (short: SP) at White's base row to a number between 0 and 959. First search for the same or the nearest smaller number from the King's Table. Then determine the difference (0 to 15) to the drawn
160:
The Fischer random chess numbering scheme can be shown in the form of a simple two-tables representation. Also a direct derivation of starting arrays exists for any given number from 0 to 959. This mapping of starting arrays and numbers stems from Reinhard Scharnagl and is now used worldwide for
1926:
For years, Reinhard Scharnagl has championed the desirability of giving each of the starting positions (SP) a unique identification number (idn) in the range 0-959 or, perhaps, 1-960. He has presented his methods on the internet and in books. See the external references. As an application, a
2393:
Given an SP, extract the bishop's code, the NQ-skeleton and its queen's position. Then, locate, in the appropriate column, the NQ-skeleton at hand, say at No. M. The Fritz9 idn = (bishop's code) + M. For the standard SP, we extract 6 RNQKNR and 1 and get Fritz9 idn = 6 + 353 = 359.
1969:
inside for the entry with the "Q" in the desired place, say at No. M. Then idn = (bishop's code) + M. For the standard SP, we extract 6 -NQ-N- and -N-N-. The desired block is the middle one in the second row, and the desired skeleton is at No. 512. We get idn = 6 + 512 = 518.
1985:
There are 16 ways to put two bishops on opposite colored squares. These are shown and numbered in the table above. The entries actually can be calculated using simple arithmetic, but the table method seems less error prone. For the standard SP the bishop's code is 6.
1960:
Starting with idn = 518, we get 518 = 32*16 + 6, and 32 = 5*6 + 2 so the bishop's code is 6, the queen's position is 2 and the N5N code is 5 with configuration -N-N-. If asterisks denote blank squares, the first rank fills up as: **B**B** **BQ*B** *NBQ*BN*
1964:
All of the multiplication and division can be eliminated by using the NQ-skeleton table below. It contains all of the 60 possible NQ-skeletons, and directly refers to all of the SPs with bishop's code 0, i.e. with bishops on a1 and b1.
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are on different colored squares. In order to both select a valid arrangement and to then concisely discuss which randomly selected arrangement a particular game used, the
2796:
Anyone with Fritz9 can verify this table by entering in the idns. It directly refers to just those SPs with bishop's code 0 i.e. with the bishops on a1 and b1.
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skipping over bishops and knights). The queen's position is the number of hyphens to the left of the "Q" in the NQ-skeleton for the SP.
83: 169: 116: 65: 141:, starts with a random selection of one of 960 positions for the pieces. Arrangements of the pieces are restricted so that the 54: 161:
Fischer random chess. The enumeration has been published first in the internet and then 2004 in his (German language) book
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is used: a number between 0 and 959 indicates a valid arrangement and given an arrangement the number can be determined.
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table into these gaps to get the starting array "RNBQKBNR", which is the starting order in traditional chess.
163:"Fischer-Random-Schach (FRC / Chess960) - Die revolutionäre Zukunft des Schachspiels (inkl. Computerschach)", 43: 1957:
q2 gives the N5N code, so put the knights on the board (of course skipping over the bishops and queen).
1990:
below showing Scharnagl's Methods and the Fritz9 Methods are independent, and may be read in any order.
1982:
done, it is always done giving a quotient (designated q1,q2,..) and a remainder (designated r1,r2 ..).
1951:
idn = q1*16 + r1. r1 gives the bishop's code, so put the bishops on the board. Then divide q1 by 6.
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according to Q, where 0 is the first free square starting from a, 1 is the second, etc.
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White's starting array can be derived from its number N (0 ... 959) as follows:
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Divide N2 by 4 again, yielding quotient N3 and remainder B2. Place a second
1954:
q1 = q2*6 + r2. r2 gives the queen's position, so put it on the board.
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Going the other way, starting with an idn, divide it by 16 and get
1931:
calculation is applied in the idn range 0-959, nothing is changed.
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Divide N3 by 6, yielding quotient N4 and remainder Q. Place the
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upon the bright square corresponding to B1 (0=b, 1=d, 2=f, 3=h).
1942:
idn = (bishop's code) + 16* (queen's position) + 96* (N5N code)
1908:
The standard starting position for chess is denoted by SP-518.
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upon the dark square corresponding to B2 (0=a, 1=c, 2=e, 3=g).
186:
Divide N by 4, yielding quotient N2 and remainder B1. Place a
26: 1999:
below shows a quick way to get the Fritz9 idn for any SP.
232:according to its value by consulting the following 57:. Unsourced material may be challenged and removed. 474:There are three blank squares remaining; place a 1945:For the standard SP, idn = 6 + 16*2 + 96*5 = 518 1546: 1935:These are shown and numbered in the N5N table. 216:N4 will be a single digit, 0 ... 9. Ignoring 8: 228:within the remaining five spaces. Place the 117:Learn how and when to remove this message 2401: 1801: 1794: 1773: 1766: 1633: 1626: 1605: 1598: 66:"Fischer random chess numbering scheme" 2806:Fischer random chess starting position 1780: 1612: 1939:SP, so its N5N code is 5. In general 1808: 1787: 1759: 1752: 1745: 1738: 1731: 1724: 1717: 1710: 1703: 1696: 1689: 1682: 1675: 1668: 1661: 1654: 1647: 1640: 1619: 1591: 1582: 155:Fischer random chess numbering scheme 7: 55:adding citations to reliable sources 1973:get bishops code = 518 - 512 = 6. 478:in each of the outer two and the 25: 1807: 1800: 1793: 1786: 1779: 1772: 1765: 1758: 1751: 1744: 1737: 1730: 1723: 1716: 1709: 1702: 1695: 1688: 1681: 1674: 1667: 1660: 1653: 1646: 1639: 1632: 1625: 1618: 1611: 1604: 1597: 1590: 1584: 31: 2818:Image of all starting positions 42:needs additional citations for 496:Scharnagl's NQ-skeleton Table 1: 2365: 2340: 2315: 2290: 2265: 2240: 2215: 2190: 2165: 2140: 2115: 2090: 2065: 2040: 2015: 2007: 1511: 1480: 1449: 1418: 1387: 1356: 1325: 1294: 1263: 1232: 1201: 1170: 1139: 1108: 1077: 1046: 1020: 1012: 446: 424: 402: 380: 358: 336: 314: 292: 270: 248: 240: 224:, find the positions of two 133:, played with conventional 2854: 2011: 1016: 1013: 486:Two-tables representation 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1933: 1929: 1925: 1916: 1912: 1513: 1482: 1451: 1420: 1389: 1358: 1327: 1296: 1265: 1234: 1203: 1172: 1141: 1110: 1079: 1048: 491:King's table 479: 475: 471: 470: 448: 426: 404: 382: 360: 338: 316: 294: 272: 250: 233: 229: 225: 221: 217: 213: 212: 207: 203: 202: 197: 193: 192: 187: 183: 182: 179: 162: 159: 154: 135:chess pieces 128: 113: 104: 94: 87: 80: 73: 61: 49:Please help 44:verification 41: 107:August 2012 1014:Remainder 77:newspapers 129:The game 2832:Category 2800:See also 149:and the 2790:RKRQNN 2764:RKRNQN 2738:RKRNNQ 2712:RKNRQN 2686:RKNRNQ 2660:RKNNRQ 2634:RNKRQN 2608:RNKRNQ 2582:RNKNRQ 2556:RNNKRQ 2530:NRKRQN 2504:NRKRNQ 2478:NRKNRQ 2452:NRNKRQ 2426:NNRKRQ 999:RKRNNQ 991:RKNNRQ 983:RNKNRQ 975:NRKRNQ 957:RKRNQN 949:RKNNQR 941:RNKNQR 933:NRKRQN 915:RKRQNN 907:RKNQNR 899:RNKQNR 891:NRKQRN 873:RKQRNN 865:RKQNNR 857:RNQKNR 849:NRQKRN 831:RQKRNN 823:RQKNNR 815:RQNKNR 807:NQRKRN 789:QRKRNN 781:QRKNNR 773:QRNKNR 765:QNRKRN 747:RKNRNQ 739:RNKRNQ 731:RNNKRQ 723:NRKNRQ 705:RKNRQN 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93:  86:  79:  72:  64:  222:Queen 208:Queen 147:rooks 139:rules 98:JSTOR 84:books 480:King 476:Rook 220:and 166:ISBN 143:king 137:and 70:news 2787:945 2781:705 2775:465 2769:225 2761:929 2755:689 2749:449 2743:209 2735:913 2729:673 2723:433 2717:193 2709:897 2703:657 2697:417 2691:177 2683:881 2677:641 2671:401 2665:161 2657:865 2651:625 2645:385 2639:145 2631:849 2625:609 2619:369 2613:129 2605:833 2599:593 2593:353 2587:113 2579:817 2573:577 2567:337 2553:801 2547:561 2541:321 2527:785 2521:545 2515:305 2501:769 2495:529 2489:289 2475:753 2469:513 2463:273 2449:737 2443:497 2437:257 2423:721 2417:481 2411:241 995:944 987:752 979:560 971:368 963:176 953:928 945:736 937:544 929:352 921:160 911:912 903:720 895:528 887:336 879:144 869:896 861:704 853:512 845:320 837:128 827:880 819:688 811:496 803:304 795:112 785:864 777:672 769:480 761:288 743:848 735:656 727:464 719:272 701:832 693:640 685:448 677:256 659:816 651:624 643:432 635:240 617:800 609:608 601:416 593:224 575:784 567:592 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Index

Chess960 numbering scheme

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Fischer random chess
chess pieces
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ISBN
3-8334-1322-0
Fischer random chess starting position
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Chess960 start positions
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Fischer random chess

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