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42 votes
Accepted

Has O-O ever been played without moving the e or g pawns?

This CQL query: cql(input Mega_Database_2022.pgn) flipcolor { { move from K o-o Pg2 Pe2 } or { move from K o-o-o Pb2 Pd2 } } returns 224 (!) games when ...
double-beep's user avatar
  • 4,350
22 votes
Accepted

What is this tactic called?

It's a discovered attack with check (the rook attacking the queen is the discovered attack, the check is the discovering move). As the discovering move is also an attack, this gives rise to a double ...
Acccumulation's user avatar
15 votes

What is this tactic called?

It's not uncommon that a tactical sequence makes use of more than one general pattern. Here, we have a double attack where one of these attacks is a discovered one (the rook on the queen) and the ...
Annatar's user avatar
  • 5,938
12 votes

What are some checkmates with very few moves from the starting position?

The Blackburne-Shilling Gambit could result in a quick loss for White if he plays some fairly plausible moves: 1.e4 e5 2.Nf3 Nc6 3.Bc4 {Italian opening} Nd4 4.Nxe5 {Free pawn!} Qg5 5.Nxf7 {Forking the ...
D M's user avatar
  • 19.7k
9 votes

What is this tactic called?

I think it is a discovered attack. Normally at a discovered attack, you do give a check to the king, eventually a double check. Here what is different is that you do a check to the king but you ...
rapaio's user avatar
  • 251
8 votes
Accepted

Why is it common to castle right after the opponent castles?

Castling is a certain 'committing' move; if you castle kingside, your king is stuck there until the late middlegame / early endgame, and you cannot easily launch a pawn storm on that side. The first ...
Glorfindel's user avatar
  • 24.9k
7 votes

What are some checkmates with very few moves from the starting position?

To add to the Fool's Mate idea, this game left enough of an impression on me to remember it. [FEN ""] 1. d4 f5 2. Bg5 {An enterprising line, threatening to weaken Black's pawn structure after the ...
Allure's user avatar
  • 27.9k
7 votes
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What's this mate called?

It does not have any special name. I have been playing for 40 years, and I have never seen it given any specific name. Here is a very good list of named mates, and as you can see, your position is ...
PhishMaster's user avatar
  • 32.6k
7 votes
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Moving a piece to a square protected by 5 opponent's pieces

Thanks to this CQL query: cql(input Mega_Database_2022.pgn) flipcolor { square x in [KNBRQ] attackedby a { move previous to x from [KNBRQ] not move previous capture a not ...
double-beep's user avatar
  • 4,350
6 votes
Accepted

Full "reverse checkers" position in GM game with 12 or more pieces per player?

Plenty! I ran this CQL query against Mega Database 2022: // Chess Q 28034 // reverse checkers position with each side having 12+ pieces cql() (dark A == A and light a == a) or // white on dark ...
double-beep's user avatar
  • 4,350
6 votes
Accepted

Take my Queen, Please

Adams - Torre comes to mind. It does not fully answer your requirements - some sacs are not side by side, some are not in the middle of the board - but still... [fen "2r1r1k1/1p1q1ppp/3p1b2/p2P4/3Q4/...
user58697's user avatar
  • 1,577
6 votes

Is it still back-rank mate when there aren't friendly pieces blocking?

First ask yourself why the differentiation of a 'back-rank mate' is meaningful. Generalized patterns that we call 'tactics' have names because it helps us to learn from them and respond to them. For ...
Grade 'Eh' Bacon's user avatar
6 votes

Which opening contains this trap?

Adding to Philip's answer, I more remember it from the Scandinavian, because there the bQ gets out early anyway and it takes much less patzer moves to irreversibly trap it this way. Example: [FEN &...
Hauke Reddmann's user avatar
5 votes

Why is it common to castle right after the opponent castles?

GM Ben Feingold recently published a lecture to Youtube on Castling vs. Non-Castling positions which helps to answer your question. When one player castles and the other doesn't, it creates an ...
Chris G's user avatar
  • 382
5 votes

Is this an Anderssen's mate or Opera mate?

I assume you took the mates' definitions from here. Then, it fits the description of the Opera Mate but I don't think that's intended – a 'real' Opera Mate doesn't happen in the corner. Then again, ...
Glorfindel's user avatar
  • 24.9k
5 votes

Which opening contains this trap?

A configuration of pieces like this can occur in many Sicilian sidelines, or with colors reversed in the English. For example 1. e4 c5 2.Nf3 Nc6 3.Bb5 g6 4.Nc3 Qb6 5.Nd5, or 1.c4 e5 2.Nc3 Bb4 3.Qb3 ...
Philip Roe's user avatar
  • 8,633
4 votes

What are some checkmates with very few moves from the starting position?

The Kieninger Trap in the Budapest gambit has trapped numerous amateurs but even some masters over the years. It involves a similar mating pattern to those found in some of the other answers. There ...
John Coleman's user avatar
  • 2,501
4 votes
Accepted

Guide to using a book

How you should use the book is really a matter of opinion, but I very much believe in immersion learning, so rather than do a few every day for a longer period, I believe that doing as many as you can ...
PhishMaster's user avatar
  • 32.6k
4 votes

Is there a name for this mating pattern?

It's rather rare that a mating pattern has a name. (Note that there is a book "1001 Deadly Checkmates" by GM Nunn, but I bet only a handful are named.) That said, the idea of sacrificing a ...
Hauke Reddmann's user avatar
3 votes
Accepted

What is the B+N checkmate position that leads to a longest mate?

Using the syzygy tablebases by just putting some B+N position in, and looking for the note that says what the longest one is, we can find that it's 8/8/8/6B1/8/8/4k3/1K5N b - - 0 1 with a DTM (depth ...
pulsar512b's user avatar
  • 1,858
3 votes

Take my Queen, Please

Another great game to see is the final move of this 1975 game by grandmaster Boris Katalymov. [Title "Boris Katalymov-Mikhail Kolpakov, Riga, 1975"] [FEN ""] [startply "65"] 1. d4 d5 2. c4 e6 3. Nc3 ...
Evargalo's user avatar
  • 16.4k
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
  • 19.7k
3 votes

What are some checkmates with very few moves from the starting position?

Here’s a simple example which I always like. [FEN ""] 1. d4 e5 2. Bg5 Qxg5 3. Qc1 Qxc1#
Laska's user avatar
  • 12.2k
3 votes

What are some checkmates with very few moves from the starting position?

Légal's mate, which Andrew mentioned, can also occur in the Italian Opening, with a move order which is perhaps more credible: 1.e4 e5 2. Nf3 Nc6 3. Bc4 d6 4. Nc3 Bg4? 5. h3 Bh5? 6. Nxe5! Bxd1? 7. ...
Rosie F's user avatar
  • 6,425
3 votes

What are some checkmates with very few moves from the starting position?

Against the Bird Opening (1.f4), black can play the From Gambit which threatens a kind of fool's mate: [FEN ""] 1.f4 e5 2.fxe5 d6 3.exd6 Bxd6 4.Nc3? Qh4+ 5.g3 Qxg3+ 6.hxg3 Bxg3# Instead of ...
RemcoGerlich's user avatar
  • 28.2k
3 votes

Why is it common to castle right after the opponent castles?

Once the first castling took place, the castled rook can easily face the king on the other side. This is a potential threat, which should be neutralized in advance. One way of handling this threat is ...
Chessfan's user avatar
  • 121
3 votes

Why is it common to castle right after the opponent castles?

A couple reasons: 1. It is the natural flow of developing. Just as one side gets their pieces out so does the other and when clear to castle they often do so and so does the other. 2. Often one side ...
Ywapom's user avatar
  • 6,111
3 votes
Accepted

Is there a name attributed to this type of checkmate pattern?

The OP had two different patterns. One is simple mate with two pieces attacking two files. The other one is just a pin and a back rank rook mate.
yobamamama's user avatar
  • 2,245
2 votes

Does this knight and rook mating pattern have a name, or has it occurred before?

I believe that that is called “Anatasia Mate,” based on Wikipeda's testimony. In Anastasia's mate, a knight and rook team up to trap the opposing king between the side of the board on one side and a ...
Rewan Demontay's user avatar
2 votes

Does this knight and rook mating pattern have a name, or has it occurred before?

That is a nice problem, with rook and knight mating a king at the edge, with one square blocked. Here's a helpmate problem which shows more examples of that phenomenon: [Title "Forsberg, Revista ...
Rosie F's user avatar
  • 6,425

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