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Noam D. Elkies's user avatar
Noam D. Elkies's user avatar
Noam D. Elkies's user avatar
Noam D. Elkies
  • Member for 9 years
  • Last seen this week
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42
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37
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164
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20
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17
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117
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14
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100
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17
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15
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91
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Top posts
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answer
31
Zugzwang where the side to move must be mated in exactly 2 moves
Jul 15
answer
29
What moves solve this mate in 2?
May 11, 2020
answer
27
On an infinite board, which pieces are needed to checkmate?
Dec 19, 2020
answer
27
Can a unique position be deduced if pieces are replaced by checkers (can see piece color but not type)
Jun 26
answer
22
Elo loss for resign vs checkmate
Dec 23, 2016
answer
21
Positions where pawn promotion to queen is worse than to other piece
Mar 7, 2023
answer
21
What's the maximum amount of material that a puzzle with unique solution can have?
Jun 9
answer
20
What is the longest known sequence of forced moves leading to a checkmate for one side?
Feb 26, 2017
answer
16
Can a King and a Knight force stalemate against a lone King?
Jan 17, 2016
answer
16
Fastest possible checkmate by en passant
May 2, 2018
Top network posts
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258
Should the formula for the inverse of a 2x2 matrix be obvious?
142
Source and context of $\frac{22}{7} - \pi = \int_0^1 (x-x^2)^4 dx/(1+x^2)$?
104
Tweetable Mathematics
91
Inverting lower triangular matrix in time $n^2$
85
Tweetable Mathematics