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Results tagged with puzzles
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user 8860
Often, a puzzle type of problem in which a tactical or positional solution is required, like White/Black to move and win”, in what is often a middlegame or endgame-esqe position. But a puzzle can also be a chess riddle, chess math, or any other non-normal chess problem. Questions about solving puzzles, puzzle apps and websites, how to understand the idea behind a puzzle, etc. are also on-topic.
6
votes
Accepted
I'm not quite sure I understand this daily puzzle on Lichess (9/6/24)
Seems Black should just play 19. ... Qxf4;
White can't recapture because the Re6 pins the White e-pawn.
White will reply 20. Bxe6, grabbing a Rook while also putting
the bQf4 en prise. But Black reto …
- 8,314
9
votes
Accepted
Threefold repetition: what's the minimum number of pieces and/or material points required?
4 pieces is the minimum, and is attained by this position though Black has the option of trading Q for N to a bare-king draw:
[Title "Draw by perpetual check or insufficient material"]
[FEN "8/8/8/8/8 …
- 8,314
21
votes
Accepted
What's the maximum amount of material that a puzzle with unique solution can have?
This must be the maximum for an illegal position (adapted from David's attempt):
[Title "_David_, v. NDE: White to move and win"]
[FEN "qqqqqqqq/qkqQqqqq/qqqQqqqq/qQQQqqqq/qqqqQqqq/qqqqqqqq/qqqqqqQQ/q …
- 8,314
0
votes
Accepted
Relationship between having a selfmate and having a checkmate?
There are certainly exceptions. Most easily, when the opponent has only the King left, there's usually a forced checkmate but there cannot be a selfmate. Likewise with Q vs. N and Q vs. B. In fact …
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11
votes
Most mate options after 6 moves
11 without discovered checks:
[FEN ""]
[startply "12"]
1. e3 e6 2. d4 Ke7 3. Bc4 Kf6 4. Nh3 Kf5 5. Bxe6+ Ke4 6. Qh5 Qe8
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8
votes
Most mate options after 6 moves
5.5 moves to 14 fool's mates:
[FEN ""]
[startply "11"]
1. b4 e6 2. Bb2 Qh4 3. Bxg7 Ne7 4. Bb2 Rg8 5. g3 Rxg3 6. f4
For 6.0 moves, start with something like 1. a3 and then reverse the colors
(1. a3 b …
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3
votes
Max percentage of mating pieces
It's easy to get 16/17 = 94.1%
[FEN "4B3/4Q3/3QQQ2/1N2B2N/4k3/1Q5Q/3PKP2/2R1Q1R1 w - - 0 1"]
On further thought that's not legal for lack of a previous Black move.
This should be fixable, but meanwhi …
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1
vote
Why is this puzzle solved
It's won for White because Q+R coordinate to attack the exposed bK which Black can't defend for long.
I assume you started 1 Rg3 g5 2 Rxg5+ Kf7 3 Rxf6+. Then Kxf6 4 Rg6+ and now:
4 ... Ke7 5 Qg7+ Rf7 …
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6
votes
Why do chess puzzles need a unique solution?
Basically for the same reason that we're not impressed by a win by
queen sacrifice if there was also a pedestrian one- or two-move mate.
There are chess problems that deliberately have more than one s …
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9
votes
Accepted
Trying to remember a zugzwang puzzle/study position
The original position has the White King on a4, no White pawn. It's the end of a composed study by Gorgiev that I find as #753 in Sutherland and Lommer's 1234 Modern End-Game Studies (1938, Dover rep …
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11
votes
Chess positions that are easy for humans but near impossible or confusing for computers
One way to fool some computers is to give them a fortress and then
offer material to trick them into opening the portcullis. For example:
[Title "White to draw"]
[FEN "8/8/pr1k4/Pp2rp1p/1Pp1pPpP/2PpP …
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6
votes
Accepted
How many different knight's tours are there?
Wikipedia
quotes several sources for a count of 26,534,728,821,064 for the number
of closed directed tours of the 8x8 board. As Brian Towers notes
in his answer, that is equivalent to the count of Kn …
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