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be checkmated, and then to work out how such a problem could be reached. Here, with just one knight, the only way to checkmate Black is to have the black king in the corner and another black piece on a2, allowing Nb3 giving mate. It might seem there are many ways to do this, but the need to avoid
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in which White plays a series of moves leading to a position in which Black can, and therefore must, give mate. Further, White is obliged to mate whenever he can, therefore he has to avoid in his series of moves a position in which he would have mating possibility (the seriesmover analogue to the
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in which one side makes a series of legal moves without reply at the end of which the other side makes a single move, giving checkmate or yielding stalemate, depending on the precise stipulation. Checks cannot be given except on the last move of the series. There are various types of seriesmover:
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legal unique moves by Black (all but possibly the last non-checking moves) followed by one move by White that mates Black. To the right is a serieshelpmate in seventeen by
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in which Black plays a series of moves without reply after which White plays one move to checkmate Black (the seriesmover analogue to the
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in which White plays a series of moves leading to a position in which Black is forced to give mate (the seriesmover analogue to the
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and then back to a1. (As usual, chess problems with unintended multiple solutions are considered flawed; they are often said to be
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Seriesmate: a directmate with White playing a series of moves without reply to checkmate Black (the seriesmover analogue to the
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1.Ka2 2.Ka3 3.Kb4 4.Kc3 5.Kd3 6.Ke2 7.Ke1 8.f1=R 9.Rf2 10.Ke2 11.Kd3 12.Kc3 13.Kb4 14.Ka3 15.Ka2 16.Ka1 17.Ra2 Nb3#
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402:, it would check the king. The black king needs to walk half-way over the board to avoid the newborn rook giving
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389:, 1947). An effective way to solve long serieshelpmates such as this is to envisage a position in which Black
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exposing the white king to check means that there is only one. The piece on a2 has to be a
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410:.) The solution here is:
308:Serieshelpmate in 17 moves
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373:Thus a serieshelpmate in
124:to describe chess moves.
383:Thomas Rayner Dawson
360:Seriesreflexmate: a
131:Thomas Rayner Dawson
40:improve this article
387:Fairy Chess Review
377:moves consists of
349:Seriesselfmate: a
338:Serieshelpmate: a
135:Fairy Chess Review
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523:Chess stubs
319:seriesmover
96:August 2021
512:Categories
438:OzProblems
419:References
367:reflexmate
362:reflexmate
333:directmate
66:newspapers
443:12 August
355:selfmate
351:selfmate
344:helpmate
340:helpmate
137:, 1947
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