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Questions tagged [pins]

A Queen, Rook or Bishop can be used to pin a pawn or piece to another piece behind it. For example, white has Bg5 and black has Nf6 and Qd8. Here, the white Bishop pins the black Knight to the black Queen.

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Common term to a position of an absolute pin or a potential discovery check

is there any chess term to describe a position where the opponent's king is shielded from a check by only 1 piece (regardless if it's your piece, which would make it a potential discovery check, or ...
d.k's user avatar
  • 101
6 votes
3 answers
997 views

g4 pawn push to remove bishop pin - why is it good sometimes? (specific example below)

In the following position, why is g4 so powerful (+4.1 according to stockfish), when g4 is normally considered a weakening move? [Title "Why is g4 so powerful here?"] [fen ""] [...
Johnny's user avatar
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17 votes
3 answers
2k views

Does move disambiguation happen before or after legality checking?

I am wondering if disambiguation occurs before or after the legality of such moves has been established. Given this position: [FEN "5k2/5n2/3R4/1n6/8/5Q2/8/4K3 b - - 0 1"] Both knights are ...
Crocobag's user avatar
  • 273
-1 votes
1 answer
126 views

Has simultaneous partial queen pinning, besides mutual queen pins, happened in a master game?

In a 3+0 blitz game, this humorous position arose. Have such mutual partial pins, wherein both players pin the others queen to their king, occurred in master games? [FEN "r3k2r/1ppb1ppp/p2bqn2/...
Rewan Demontay's user avatar
4 votes
1 answer
113 views

Pinned piece chain

How long a "Pinned piece chain" can you make? Here a "Pinned piece chain" is a chain of pieces where each is pinned by the last. Here for example is a chain of length 3. The ...
blademan9999's user avatar
1 vote
0 answers
88 views

A double pin: does this count as check? [duplicate]

I was thinking about this position. [FEN "4k3/8/4q3/8/8/8/8/2K1Q2r b - - 0 1"] [startflipped ""] Can the Black queen move to another file? If she moves then there is nothing ...
enochk.'s user avatar
  • 119
3 votes
1 answer
576 views

Are there any games with 4 pieces (for the same player) pinned on the same rank?

In Caruana–Berg (Dresden, 2008), after 26...Ne6, White has pins on all three of Black's pieces on the 6th rank and eventually gets a winning endgame.[1] [FEN ""] [Title "Caruana—Berg, ...
SecretAgentMan's user avatar
12 votes
4 answers
1k views

Why is it a blunder to capture this pawn even if its defender is pinned?

[FEN "1r1q1rk1/p4pp1/3p1b1p/2pQ4/4P3/P1P2P2/1P2B1PP/1K1R3R b - - 0 20"] [Title "The Position"] 1... Bxc3?? In this position, I believed that the best move for Black is Bxc3. It’s ...
hb20007's user avatar
  • 1,082
5 votes
1 answer
290 views

When should I care about an opponent's pin?

This has been a problem that has been vexing me for a while, and it manifested again in my most recent game in which I played Black: [FEN ""] 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. Nf3 e6 5. Bg5 ...
Valuska's user avatar
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4 votes
3 answers
1k views

Which opening contains this trap?

The sequence of moves for White is Nd5, Bb4, and then Bb5, capturing the queen by a fork. The pattern should look something like the below position. I remember that I've seen this trap in some opening,...
nik tomas's user avatar
1 vote
0 answers
263 views

Is this a possibly faster way to find pinned pieces using magic hash?

Okay so this is something that I came up with while working on my own engine, but I am not sure if anyone has ever tried. Basically I am using a separate set of magic hashed longs to store pieces and ...
Debabrata Roy's user avatar
0 votes
3 answers
222 views

Why doesn't greek gift work in Pozsonyi vs Pataki 2005? Or does it?

original game. i'm asking about move 21. [Event "Ch Hungary (team) 2005/06"] [Site "HUN"] [Date "2005.12.04"] [Round "?"] [White "Istvan Pozsonyi"] [...
BCLC's user avatar
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3 votes
1 answer
184 views

Does this bishop sac when your knight is pinned to your queen have a name?

This is a common tactic in various openings. It goes like this: A bishop pins your knight to your queen You sacrifice your bishop with check to attract the king forward You give a check with your &...
Devon's user avatar
  • 139
11 votes
1 answer
669 views

Moving absolutely pinned piece to give checkmate: has this ever occured in a master game?

We know that an absolutely pinned piece (a piece pinned against its own king) can move and give a check, and the check can even be a mate. The following is an example of such a checkmate. [FEN "8/...
Cyriac Antony's user avatar
27 votes
6 answers
13k views

Why is this a checkmate?

I'm new to chess and I'm confused about a puzzle I was practicing. As you can see my black queen has put the white king in check, but I'm confused how this is possible if a rook is right next to my ...
Sandrine Lorin's user avatar
2 votes
2 answers
226 views

Why does stockfish suggest bishop pins on knights early on?

Stockfish suggests the following pin for me (white) against the queen on the night. However, whenever I play this move in real games black just kicks the bishop off with pawn to h6. I end up just ...
Graham Casey Gibson's user avatar
3 votes
2 answers
628 views

Why does White play Nc4?

I was solving some problems on chesstempo. This one caught my eye (the White just played Ng2, we play as the Black): [FEN "1k5r/pp4p/5b1p/qPP/N2r1p/P4P/K1Q3PP/2R3R w - - 0 1"] 1. Nb2 I saw ...
Zhiltsoff Igor's user avatar
8 votes
2 answers
1k views

Why don't masters prevent the pin after Bg4 in the modern Italian game?

In the Italian game, according to the Lichess masters database, the play usually starts similarly to [FEN ""] 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d3 d6 6. O-O O-O 7. Bb3 However, ...
marmistrz's user avatar
  • 253
1 vote
1 answer
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Most pins in a chess game

I've looked at a few chess games on ChessBase that have a lot of pins, and I am wondering, what is the most number of pins that has occurred in a game, and what is the game?
user avatar
4 votes
1 answer
180 views

Pinning Combination

There are are four types of pins. Absolute Pin-A piece is pinned to the king and cannot move due to the resulting illegal check. Partial Pin-A piece is pinned to the king and can move along pinning ...
clueless's user avatar
7 votes
5 answers
2k views

Why is Bd6 better than Be7, Bc5 and Bb4?

[FEN "r1bqkb1r/p4ppp/2p2n2/3p4/8/2N5/PPP1BPPP/R1BQK2R b KQkq - 1 9"] Be7 protects knight from getting pinned, Bc5 pins the pawn on f2 after Whites, castles, and Bb4 pins the knight. Whats ...
Shreyash Talpade's user avatar
6 votes
1 answer
819 views

Why pin knights early in the opening?

I am a beginner amateur player, and I have been thinking about openings. On lots of occasions the opponent pins the white knight on Nc3 or Nf3 (as black) or the black knight on Nc6/Nf6. What is the ...
winawer's user avatar
  • 256
0 votes
2 answers
361 views

Queen's gambit declined: is it too late to counter-offer my c pawn if white pins my f-knight? Will this overload my f bishop?

In the traditional queen's gambit, white offers their c pawn to the e5 pawn, threatening to take back with their f bishop and enjoying a central pawn advantage. My response is to play symmetrically, ...
TZubiri's user avatar
  • 119
4 votes
1 answer
181 views

Capturing (almost) free piece by King [duplicate]

Here's a position in a chess puzzle: [Title "White to move"] [fen "5rk1/p7/Q1n3pp/3q1p1n/2B2P2/4P2P/P5rK/R4R2 w - - 0 1"] The rook had captured a pawn, resulting in a check. The rook is supported by ...
user638473's user avatar
5 votes
2 answers
1k views

Chess Engine: Generate a Bitboard of Pinned Pieces

I'm currently working on a chess engine and have a pseudo-legal move generator working. I'm looking for a way to efficiently generate a bitboard of pinned pieces, so I could skip them when generating ...
Ori Yonay's user avatar
  • 141
4 votes
3 answers
899 views

An Interesting Idea: Pinned Pieces Stalemate

I had an idea for a type of stalemate: One side is stalemated with 8 pins in a legal position with as many pieces as possible, with all of the stalemating side’s units being “necessary.” ”Necessary” ...
Rewan Demontay's user avatar
7 votes
4 answers
1k views

Is this considered checkmate if I touch a piece which can't make a legal move?

What if there's a touch move rule, and my knight or bishop is blocking my king, and I touch it. Is that a checkmate? If not, what is it called?
Kiro's user avatar
  • 79
5 votes
2 answers
1k views

How do you deal with the pinned knight on f3 in the Ruy Lopez (as white)?

I find myself in positions like this a lot when playing the Ruy Lopez: [fen ""] 1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. O-O Bg4 If I try to kick the bishop out with 5. h3, they back up to h5 and I'm in ...
Derek Allums's user avatar
  • 1,127
15 votes
3 answers
5k views

How to decide when is a3/h3 needed?

a3/h3 are frequently used to prevent the bishops from pinning the knights. I always have a hard time deciding whether to play them or not. Playing them loses moves and tempo while not playing can ...
Ritesh Singh's user avatar
11 votes
4 answers
3k views

Failing to understand a pin from a tactics book

I've began going through, over the board, 1001 Winning Chess Sacrifices and Combinations - 21st century edition. This book is a great supplement to my last question on studying tactics, and I feel ...
user avatar
32 votes
4 answers
4k views

When capturing en passant, is a position possible such that there is a pin over the square of the taken pawn, rather than the taking pawn?

I am trying to write a simple chess program, and as part of this I am writing methods to find all valid moves. I can detect pins and have no trouble leaving out the moves that would result in the ...
11684's user avatar
  • 1,296
2 votes
1 answer
431 views

Why is exposing my queen for capture better in this position (According to computer analysis)?

In one my of my game, the following position appeared (me white): Computer analysis says that I should have played Nf3 (exposing my queen being captured by the bishop). In the proposed scenario by ...
FNH's user avatar
  • 219
6 votes
2 answers
3k views

Detect pinned pieces code

This post is a follow up of this one: C++ vs Java Engine move generation performance My goal here is to improve the performance of my move generator, which finishes perft (start_pos, 6) in 8.5 secs. ...
Fernando's user avatar
  • 425
3 votes
5 answers
914 views

Pinned Vs. Checkmate

So say my queen is pinned in front of my king by the opponents rook. However if I move my queen to check their king it is certain checkmate, is that legal? I'm not sure because I'm intentionally ...
Tyler Gulick's user avatar
11 votes
2 answers
8k views

How to handle the standard Bb4 (or Bg4 / Bg5 / Bb5) pin?

Here are two extremely common pins, given from white's perspective for clarity: A black bishop at g4 pinning a white knight at f3 to the white queen at d1. A black bishop at b4 pinning a white knight ...
Potato's user avatar
  • 489
56 votes
3 answers
24k views

Can a piece pinned to my king put the opponent's king in check?

I was playing a game with a friend online. A situation came up where he put me in check with his bishop, and I moved my rook to block it. His king was on the g file and my rook was on g2. The website ...
ken's user avatar
  • 571
19 votes
4 answers
5k views

Bizarre pin rule: pinned pieces do not attack

I found this guy who likes playing chess, but not enough to bother reading the rules; he only plays using a physical board with his sister (she doesn't know the rules either). The made up rule was ...
ajax333221's user avatar
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