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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.

3
votes
2answers
248 views

How to 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 ...
11
votes
3answers
500 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 ...
11
votes
4answers
2k 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 ...
23
votes
2answers
2k 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 ...
1
vote
1answer
147 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 ...
5
votes
2answers
708 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. ...
8
votes
1answer
3k 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 ...
26
votes
3answers
11k 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 ...
13
votes
5answers
3k 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 ...