ETD
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How many positions are there in n-pieces endgame tablebases for different values of n?
5 votes

This depends a great deal on how (and what) you count. In a discussion at the CCRL board, Kirill Kryukov offers the following counts on the number of unique legal positions (NULP) for some small ...

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QGD :: should Black fiancheto his King's Bishop?
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5 votes

The main reason why Black tends not to fianchetto in this position is because she has already played ...e6, which in conjunction with playing ...g6 to develop the bishop, unnecessarily weakens the ...

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Sacrifices, initial loss and a volte-face?
5 votes

When I read the phrase "sacrificing each and everything" in your question, my mind went to the game Serper-Nikolaidis, in which White does, well, that. By the time of 35.c6, each of White's original ...

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Simple programs for recording chess games -- Like ECTool -- for Ubuntu and Windows
5 votes

It sounds to me like what you want is a chess database program. If so, the one I would recommend is Scid, which is totally free, and comes in Windows, Linux and Mac flavors.

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How does White justify giving up the bishop in ECO C36 - King's gambit declined
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5 votes

I think Jonathan Garber's comment about trying to gain time against the Black queen after 6...Qxd5 7.Nc3 accurately describes what one motivation for 6.Bxd5 can be, though I also think that Black ...

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Recent research, or analysis sites, about some chess variants?
5 votes

I'm not sure if this is the sort of item you might be interested in, but Dave McCooey generated complete (pawnless) 4-man tablebases for hexagonal chess on the 91-"square" board, and has a full ...

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Is a timed game less strategic than a non-timed game?
5 votes

I think there's little truth to the idea that memorization plays a greater role in blitz than it does in longer time controls. When playing blitz, a player might tend be a bit more "habitual" in the ...

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Options for breaking the Giuoco Pianissimo wide open?
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5 votes

After 1. e4 e5 2. Nf3 Nc5 3. Bc4 Bc5 4. d3, you could continue with 4. ... Nf6 and aim to follow this up with an immediate 5. ... d5 if you want to open the center. For instance, play could proceed ...

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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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Solving a problem from a Jan Prezewoznik book
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4 votes

The nature of the problem that this position presents is first this: to correctly assess the situation on the board, and in particular to recognize the immediate and impending problems White is facing....

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Books on drawing
4 votes

Books focused on defense essentially fall into this category. When defending a difficult -- or especially an objectively lost -- position, the best one can realistically hope for absent a major ...

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Can White engineer a winning breakthrough?
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4 votes

To aim for a draw for Black, I would play against the fact that the white rook has trapped itself out of play on c4 once the move c3 was played. If Black can get in ...c5 then even after an en passant ...

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What are the options for solving puzzles online and tracking progress?
4 votes

ChessTempo allows for unlimited solving of tactics problems with a free membership. It has a large database of problems drawn from games, and it tracks your solving statistics along with your ...

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"Parity" of "insuficient mating material"
4 votes

It is a little unclear exactly what you are after, but the following portion of the question points to an area where something directly mathematical is going on: Sometimes you can see a checkmate, ...

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Is this Rook versus Bishop endgame winning for white (white to move)?
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4 votes

This ending is drawn, and the main thing that Black needs to avoid, and which White should aim for, is having her king driven toward the a1 or h8 corner (the problem being that those squares are the ...

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Make checkmate with pawns without promotion
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4 votes

As Daniel indicated in a comment, the answer here is that, no, White cannot force checkmate without promoting at least one pawn. Enough toying with the position makes this pretty clear, intuitively. ...

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Does ECO openings classification have an established more detailed specification - by sub indexes?
4 votes

A particular ECO index might split further into sub-indices like B33a, B33b, B33c, etc. The number of such sub-indices varies (maybe it goes up to y, or only to t, or ...), and some indices don't have ...

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Is there any software or web service for club-level Elo ratings?
4 votes

I just downloaded and played around with a lightweight freeware item for Windows called ELORater that seems to provide what you're after. You can create a "group" for your club, and then add players ...

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What are some good quality magnetic chess sets?
4 votes

I know you'd prefer a non-folding board, but since you say that's not a deal-breaker, I'll point you to the ChessMate TravelMate Deluxe set. It has nice wooden pieces and quite strong magnets. If you ...

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Is a timed game less strategic than a non-timed game?
4 votes

I'm posting a second answer here in order both to distill some of the back-and-forth that's gone on in comments, shedding light on where disagreements lie, and to perhaps to answer the question ...

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In the immortal draw, why is the Queen sac 9...Qxa4+ considered the best move?
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4 votes

In the diagram position, White has an extra bishop, and as compensation Black has both two extra pawns and, as you mention, prospects for an attack based on the fact that the white king is out in the ...

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Did any authors ever try to adopt Hans Kmoch's pawn structure terminology?
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4 votes

This doesn't quite answer my question, but I find it interesting nonetheless, and think it's worth mentioning. While Kmoch's overload of terminology can serve more to get in the way of a person's ...

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Is there any chess engine that can show if one side has a forced draw?
4 votes

Just as engines can, at certain points, see a forced mate some number of moves away, because there are forcing enough lines that the engine can see everything perfectly in the remaining depth until ...

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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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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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Chess puzzle that is hard to understand
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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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The Anderssen v Zukertort game in the Yamie Chess kids' math boardgame
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3 votes

Objectively, I think you are right that 8.Nxf7 is a somewhat weak move. But it is also an unsettling, complicating move that poses a concrete defensive problem, enough of one in fact that a (truly!) ...

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Alpha-beta safe on incomplete tree?
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3 votes

As far as I can tell, you are crystal clear conceptually, and you aren't actually missing anything. I think the source of any apparent conflict between your understanding and the quoted passage is ...

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How many materially equal positions are there?
3 votes

What follows is basically a partial answer that is heavy on explanation, plus a pointer for using it to obtain a fuller answer if so desired. Suppose we start with a blank 64-square chessboard and ...

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