ETD
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How do you calculate your Tournament Performance Rating?
1 votes

This answer spells out the actual calculation of performance rating for USCF tournaments, as in the June 2017 Rating Estimator that Fred Knight's answer points to. If you view the page source at that ...

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Formulating a Precise Definition of "Space" in Chess
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2 votes

Considerations such as yours for a definition of "space" have long been a part of computer chess, and I suggest looking to that literature for ways to approach a precise, quantitative definition. The ...

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A purely self-trained chess AI
21 votes

It's worth revisiting this question in light of the recent striking success of AlphaZero against Stockfish 8. A further evolution of DeepMind's AlphaGo and AlphaGo Zero programs, AlphaZero finished ...

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Drawn R+2P vs R endgame
Accepted answer
11 votes

I don't know the game you have in mind, but the following is one example of such a drawn position in this ending (as can be verified with a tablebase query): [fen "8/8/1r4kP/6P1/2R2K2/8/8/8 w - - 0 1"...

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Bobby Fischer and the U.S
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7 votes

It is not so much that Fischer got exiled as much as it was that he chose to exile himself (though yes, out of a certain necessity). He was indicted by a U.S. court for ignoring sanctions against ...

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SCID not recognising transpositions
2 votes

Chess Position Trainer recognizes transpositions in exactly the way that you're after, as it stores its opening books in a way that's designed to address this issue. Whenever two variations (like your ...

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Is chess a solved game?
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34 votes

Because of the observation you make, that the tree of possible game paths for chess is finite, chess is indeed solvable in exactly the same sense that tic-tac-toe is. So optimal strategies for chess ...

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Kasparov quote reference
5 votes

The following passage is from Botvinnik's foreword to his 100 Selected Games. The text here doesn't single out one's own games as the specific object of analysis, but it leaves no doubt about ...

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How can I find games from grandmasters that end in threefold repetition?
6 votes

If you have a collection of games in PGN format, you could probably search for threefold repetitions using the Chess Query Language. In particular, you might look in the "Matching positions: the ...

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What is the result of this pawn-endgame with perfect play by both sides?
1 votes

Analysis of this general endgame appears in Staunton's Handbook, in the section "King and Three Passed Pawns against King and Three Passed Pawns." In the preceding section of the book, "King against ...

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Evans Gambit b4 loss
5 votes

Compare the position after 3...Bc5 to that after 4.b4 Bxb4 5.c3 Bc5 6.d4. [fen ""] 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5 6.d4` It's true that the Black bishop has simply returned to c5 and ...

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Why is g4 the best move in this Queens Gambit accepted line?
8 votes

I suppose you have some source that claims 1.g4 is the best move from the diagram position, but which doesn't give any reason for it. I won't try to weigh in on whether it is in fact the best move ...

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Is this endgame a draw? 2 Bishops + 4 Pawns vs Queen + 1 Pawn
Accepted answer
20 votes

Black is winning handily from the diagram position, and has a fairly straightforward strategy going forward: force the b-pawn's advance to b2 with the support of the bishops (starting with 1...Be6 to ...

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Wording of Troitsky line rule
2 votes

I believe that GloriaVictis' answer addresses your first position very well, in that the pawn is not actually securely blockaded in that case; Black can force the further advance of the pawn. Your ...

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Professional match where neither player castles?
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11 votes

It won't be terribly common, but it's not unheard of either. Here are a few examples involving well-known grandmasters: Ivanchuk-Csom (1989): [fen ""] [Event "Yerevan"] [Site "Yerevan"] [Date "1989.?...

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Lowenthal-LabourdonnaisSicilian Kalashnikov Variation
3 votes

While it's a somewhat dated source by this point, I'm certain that Neil McDonald's 1995 book Winning with the Kalashnikov covers this 6.Bg5 variation to some extent, and I'm nearly certain that he ...

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Why do houdini and stockfish give this seemingly stupid move?
Accepted answer
13 votes

In the given position, Black ultimately has no way to avoid an impending checkmate, hence is lost no matter what. The engines you're consulting are just trying to push that unavoidable mate as far ...

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What is the maximum DTM with K+J vs K?
5 votes

I don't know the exact answer for the 10x8 board (used e.g. in Capablanca Chess, where your Janus is called the Archbishop), but I have something that could get you well along toward an exact answer, ...

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Normal draw positions in the endgame KQPKQ with a bishop-pawn?
1 votes

The weaker side cannot win the pawn, nor has a perpetual check nor can play on stalemate. Is there any drawing position left with all these conditions? I will answer this with a no, and for a ...

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Longest sequence with only moves to draw without a repetition
3 votes

To get the ball rolling, from the following position the first 6 moves for each side are forced in order not to lose. (If 7.h8=B weren't available and 7.h8=Q needed to be played, then the forced ...

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Gambit openings for black recommendation?
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10 votes

Two gambits that your opponents would likely play into a fair amount, and are defined by move two, are the Latvian Gambit (1.e4 e5 2.Nf3 f5, like a reversed King's Gambit) and the Albin Counter-gambit ...

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Can someone explain how this pawn endgame works?
Accepted answer
5 votes

I think considering an intermediate position first helps clarify what is going on. Consider the following position with Black to move. The white king is on d4, poised to head for infiltration on ...

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Overprotection Of A Piece
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8 votes

From the cited Wikipedia article: The strategy of protecting a pawn or specific square of the chessboard more than is immediately necessary. This serves to dissuade the opponent from attacking that ...

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Pawn Promotion to Queen
6 votes

You may do so only if the pawn is capturing one of the opponent's pieces; that is the only way a pawn ever moves diagonally. So here you can do what you describe: [fen "3Rn3/k2P4/8/8/8/K7/8/8 w - - 0 ...

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What are the winning chances of every pieces? (6men egtb)
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4 votes

I don't know a single source tabulating the winning percentages for all 6-piece endings, but at least some amount of summarizing information can probably be found scattered throughout Nunn's Secrets ...

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Can you identify this game with a mate in 12?
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12 votes

I can't find the actual game neither in my database nor at, say, chessgames.com. However, the position appears as puzzle 210 -- with the apt description "Running around like a squirrel in a cage&...

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Is capturing a piece while castling legal?
Accepted answer
13 votes

No, such a move is illegal, because one requirement of castling is that there be no pieces (of either color) standing between the king and the rook. From the FIDE Rules of Chess, 3.8(b): ...

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Mac computer chess
2 votes

Are there situations where pawns can't take knights or Kings can't take queens or rooks? Yes, all the situations described in your post could happen, consistent with the rules of chess. For instance, ...

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Chess puzzle that is hard to understand
Accepted answer
3 votes

The point is that after 1...Rxe3 Black will be winning material, as the sole defender of the white knight has been removed, and a pin tactic is coming. Specifically, after 2.Rxe3 (anything other than ...

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Longest DTC in the endgame KQPKQ depending on the place of the white pawn
3 votes

Here is a partial answer. The paper Chess Endgames: Data and Strategy by Tamplin and Haworth reports, among other things, the maximum depth-to-conversion (DTC) and depth-to-zeroing (DTZ) among ...

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