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Results tagged with problems
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user 8860
Chess problems consist of a board position and a task. Most ask for a line of play that mates black in a set amount of moves, or a combination that results in a winning position. Many other types exist, including, but not limited to, construction tasks for various positions and proof games that have numerous goals, selfmates, helpmates, and retrograde analysis. Tournaments and championships exist for composing of original problems and for speed-solving.
1
vote
2
votes
What kinds of unconventional chess problems exist?
Try also Burt Hochberg's Chess Braintwisters,
which often require "thinking outside the box" to a move that is
logical but illegal (like promoting to a King) and thus would never
be found by an ordina …
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11
votes
Accepted
Position where neither player can force an *exact* outcome
Such a position must be a draw with best play.
Here's one where either player can make a winning threat
that can only be parried by giving checkmate:
[Title "Neither player can force an exact outcome" …
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4
votes
Accepted
9
votes
Is it possible to have a double self-smothered stalemate?
Here's a simpler mutual smothered stalemate
(9 men on a side, no promoted pieces):
[Title "Mutual smothered stalemate"]
[fen "5brk/4p1pb/4P1p1/6P1/1p6/1P1p4/BP1P4/KRB5 w - - 0 1"]
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3
votes
Position with the most (or many) distinct refutations?
Squeezing yet another mate from Dag Oskar Madsen's construction,
for a total of 19:
[Title "Black to move"]
[SetUp "1"]
[FEN "R6Q/6B1/2p3K1/8/8/3pN3/rb6/kq5R w - - 0 1"]
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2
votes
Position with the most (or many) distinct refutations?
... and yet another mate, for a total of 20, at the cost of a few more
White units including a second Queen:
[Title "Black to move (after Dag Oskar Madsen)"]
[SetUp "1"]
[FEN "Q3Q2B/8/4P1K1/1P4 …
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29
votes
What moves solve this mate in 2?
White to play checkmates in 2 with 1 d4+! exd3 e.p. 2 Qbf4#.
Black to play cannot checkmate in 2 but should win after Bxf7.
7r/1p3Q1p/2q5/3bk3/1Q2p3/2P5/r2P2PP/2KR4 w - - 0 1
1. d4+! exd3 2. Qbf4
…
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6
votes
Position with the most (or many) distinct refutations?
Jeremy Morse's Chess Problems: Tasks and Records,
as I should have done before entering this fray. The specific task posed by
I.J. … Kennedy is not addressed, but there are several problems that come close
while pursuing some other goal. …
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8
votes
Selfmate problem
Neat:
[FEN "8/7P/8/p2p4/P2p4/pB1p4/3P4/k2K4 w - - 0 1"]
1. Kc1 a2 2. Bc2 dxc2 3. h8=R! d3 4. Rb8 d4 5. Rb4 {And from here on, both sides' moves are legally forced.} axb4 6. a5 b3 7. a6 b2#
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1
vote
Accepted
Maximum futile material (in illegal position) neither winning nor forcing stalemate
If I count right we actually do a bit better than Hauke Reddmann's
construction by giving White a pawn and the initiative:
[FEN "kqqqqqqq/Pqqqqqqq/qqqqqqqq/qqqqqqqq/qqqqqqqq/qqqqqqqq/qqqqqqrb/qqqqqqbK …
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7
votes
Accepted
Is Behting Study Still Beating Computers?
For the record, the soundness of the Behting study has been under a cloud for some time because it is not easy to refute 1 Ng7+ Kg5 2 Nf3+ Kg4 3 Kf5 h3 4 Ke4 g1Q 5 Nxh6+ Kh5 6 Nxg1 h2 7 Nf3 h1Q 8 Nf5 …
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5
votes
Move forcing opponent to checkmate in response
See item #334 in Krabbé's Chess Diary https://timkr.home.xs4all.nl/chess2/diary17txt.htm for candidates for "the worst move possible", in the sense that you have many moves, all of which are mate in 1 …
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31
votes
Accepted
Zugzwang where the side to move must be mated in exactly 2 moves
As Laska suggested, I was able to find it
in my 2001 files of correspondence with Richard Stanley:
[Title "Whoever moves must get mated in 2 moves (NDE 2001)"]
[FEN "BKQQ4/pPPP4/rbkp4/qrbp4/bp1p4/1p1P …
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2
votes
Accepted
What rearrangent of the starting position's pieces, in any manner, has the fastest stalemate?
Down another ply to 17 (stalemate after White's 9th move):
[Result "1/2-1/2"]
[FEN "brqnkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBRKBNQ w - - 0 1"]
1. h4 h5 2. g3 f6 3. Qxb7 Kf7 4. Qxc7 Be4 5. Qxd7 Rh6 6. Qx …
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