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Give a legal position which is "dead" but would take (assuming the §5.2.2 about dead positions wouldn't exist) maximally long to play out until an automatic draw by fivefold, 75 moves or statemate res …

Records for PNBRK with m=0 are known and neigh beatable. This record for this question is completely unknown.) …

Clearly a spawnoff of the preceding question, but far easier to analyze, and maybe helping a bit to solve that one too. Take the starting position, remove all black pieces to simplify and now make onl …

8/8/7K/p7/R3b2k/6rP/4p3/4B1N1 w - - 0 1 This is an age old record by Shinkman: Black is stalemated if having the move, but the White move 1.Bb4 grants 32 moves. (Don't bother trying to top that...) N …

"There is an essential distinction between a chess problem and a composed endgame. In an endgame the solver has to demonstrate a win or draw for white against a superior, or at least an equal force [. …

This is the "opposite" of A mobility puzzle - I held it back because it could have interfered with Schwalbe 2021 construction challenge. Thus: Put a maximal number m of pieces on the board such that t …

Obviously inspired by the analogous selfmate question. (Helpmate would also be possible in principle, but looks a bit silly.) Thus, 1.f3 e5 2.g4 allows Black a #1, and 1.f3 e5 2.h3 a #2. 1.f4 e5 2.N …

Duh. Clearly, the one shown there with Qxh5+ Rxh5# can be easily turned into a s#2, by e.g. B-e2-f3, Qe2 from White and c6, Q-a5xd2-d1 from Black. 9.0 moves if I added correctly. Someone care to beat …

I accidentally ran into this game again. [FEN ""] [startply "7"] 1. e4 e6 2. d4 Qf6 3. e5 Qf5 4. Bd3 What would be the fastest way to lose a queen by a direct attack on it (i.e. no pin, no …

Easy one: Starting position, but Black never moves. White makes n moves (no checking!) until Black is stalemated. Minimize n. Hint: You don't need to capture all Black pieces, pawns can also be blocke …

I expect that Zagler, who even made a systematic for one-mover records, also did the duplex version (any move for both sides selfstalemates), but could not dig it up on the existing databases. …

A model mate, to recall, is a mate where a) any flight (including the standing place) of the enemy king is attacked exactly once; b) no friendly piece (except king and pawns) idles around. c) (Compli …

In the newest SCHWALBE, positions are given where any piece on the board can give a check (any being surprisingly high). A quick dabbling seems to prove that it is not possible that any piece can mate …

Play the longest game from the starting position such that each move resets the 50 move rule (i.e. is a pawn move or a capture). As I see it, each pawn quartet on adjacent lines has maximally 4+6+6+6 …

I have a lot of questions about ratings, which are sort of connected, but I think I better split them. This is pair 1. I Googled a bit: By definition, ELO>100, and someone said (chess.com) he knows s …