Skip to main content
24 votes

Is this endgame (sort-of Q vs K) a draw?

According to the Lomonosov tablebases, it's mate in 40 for black. While the queen can't force mate by herself, she can force a zugzwang. In this case, when the bishop is forced to move to e8. Then, it'...
Herb's user avatar
  • 4,196
21 votes
Accepted

Is this endgame (sort-of Q vs K) a draw?

Here's a simpler way to see why it's winning for black: You're right that the queen cannot checkmate the king by itself, but it can stalemate the king [*] (an example pointed out by Ionut Deaconu) and ...
Ellie's user avatar
  • 12k
16 votes

Why doesn’t Stockfish evaluate this fortress as 0.0?

Depth 64 means 64 half moves, it includes moves both by white and black. It isn't close to being able detect draws by means of the 50 move rule (100 plies). Especially since that is only the depth of ...
RemcoGerlich's user avatar
  • 28.1k
16 votes
Accepted

What is a fortress in chess?

A fortress in chess is a position in where the weaker side defends by making waiting moves, and where the stronger side cannot make any progress as long as the defender does not make a crazy move. A ...
Scounged's user avatar
  • 7,998
12 votes

Is this endgame (sort-of Q vs K) a draw?

You're right, at the first sight it looks like a draw: Black's king is kept out of play and the Queen cannot checkmate alone. Black's only idea for a win would be to sac the Queen on h2 and try to ...
Ionut Deaconu's user avatar
10 votes
Accepted

Is this a fortress?

White defends, but it is really a pain to hold this position. It took me few minutes to formulate correct plan since Stockfish found some strong ideas for Black. Below is the image of the fortress ...
AlwaysLearningNewStuff's user avatar
9 votes
Accepted

Technique to win this same colored bishop endgame

The key here is zugzwang - White has an ideal defensive position at the moment, his king stops yours penetrating, his bishop covers the weak pawns on g4 and c4, and the pawn on a5 you can't easily get ...
Ian Bush's user avatar
  • 4,387
6 votes

Is this position a fortress?

I took the liberty of consulting with the Syzygy tablebases for a while, and came to the following conclusion: the endgame is drawn. This is far from obvious, but it has to do with the following ...
Scounged's user avatar
  • 7,998
5 votes
Accepted

Amazon vs Chancellor endgame

This is a great question and a fun problem to mull over. Indeed the way it's written on wikipedia one gets the impression that amazon-vs-empress fortresses are trivial and easily attainable for the ...
Ellie's user avatar
  • 12k
5 votes

Why doesn’t Stockfish evaluate this fortress as 0.0?

This is an easy position for Stockfish with tablebase, but very hard without it. The only way Stockfish can work out it's a draw is search all the way through 50-move draw. Otherwise, it'd think the ...
SmallChess's user avatar
  • 22.5k
5 votes
Accepted

Pogchamps: How does Michelle Khare beat Pokimane (rook and knight vs rook pair)?

I can only try to give a very generic and partial answer, since details matter extremely. I shamelessly copy stuff from Müller/Lamprecht "Fundamental Chess Endings". Q2 can be answered ...
Hauke Reddmann's user avatar
4 votes

Is the following position a fortress?

The key to tackling these kind of positions in a game is to imagine where you would like to put your pieces and then see how you could achieve that. In this position for white the first aim would be ...
Brian Towers's user avatar
  • 98.1k
4 votes
Accepted

Can black make any progress in this end game?

It does look like a fortress. After 1...Qe2+ 2.Bb2 Qd2 White can wait with Ka2-b1-a2 or Bb2-a1-b2 depending on where the queen sits. Black cannot bring the king to d4 because of discovered checks, so ...
Evargalo's user avatar
  • 16.1k
3 votes

How does Anna Rudolf beat Hikaru Nakamura in this rook vs queen endgame fortress that came from a choker game (chess + poker)?

Eric Half-An-Answer: He talks about a fortress, obviously :-) As far as one can talk generally, when trying to storm a fortress in a position with material Q/R plus pawns, the win method often is to ...
Hauke Reddmann's user avatar
3 votes

What is a fortress in chess?

It's a position with a big material disadvantage that still can be held. Eg. White: Kg1 Pg2 Black: Kd2 Pg3 + Bishop anywhere You are piece down but the opponent still can't win. Your position is a ...
hoacin's user avatar
  • 3,286
3 votes
Accepted

When are games against engines drawn?

Try the TCEC adjudication rules, adapted for your situation. You can use more aggressive (or less aggressive) adjudication rules if you need them, e.g. by changing the threshold eval needed for ...
Allure's user avatar
  • 27.7k
3 votes
Accepted

What is this formation called?

In this question the formation is referred to as a "turtle formation", although that's in the context of Bughouse. I've also personally heard it referred to that way in the context of Bughouse when ...
D M's user avatar
  • 19.6k
2 votes
Accepted

Computer being right and human being wrong

This has definitely happened in endgames, e.g.: Queen and a minor piece versus two rooks: this is usually a draw for a knight and a win for a bishop, although the win takes up to eighty-five moves. ...
Allure's user avatar
  • 27.7k
1 vote
Accepted

Testing Mate Possibility Without Use of King

Engines don't usually complain that the initial position you give them isn't legal so any tabiya for the engines immobilized king doesn't have to be legal. Nevertheless I think this tabiya is legal. [...
Brian Towers's user avatar
  • 98.1k

Only top scored, non community-wiki answers of a minimum length are eligible