Questions tagged [transpositions]

A transposition is when a series of moves leads a game from one opening into another.

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1 answer
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My Transposition Tables implementation slows down Alpha Beta Pruning

I have this implementation of alpha beta pruning I made a couple days ago. I've been trying to look into transposition tables. When I tried this implementation it was slower than the original code. I ...
5 votes
3 answers
544 views

How to understand which positions result from certain opening

I was watching Irina Krush's great lecture on YouTube and, at 20:06, she asks "Which opening is this position from?" The answer is apparently the Sicilian, which made me wonder. How do you ...
2 votes
2 answers
244 views

Marshall Defense transposition to Gruenfeld

Can this move order be considered a good surprise weapon against 1.d4 players since the Marshall Defense is known to be dubious and now black is trying to transpose it to a Gruenfeld. From my ...
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4 votes
1 answer
164 views

Transposition Tables Bug, implementation produces different results

I've been writing my chess engine for 2 months now, and I've come across this bug that I can't manage to solve. Basically, when I disable my transposition table, the engine plays fine and the minimax ...
3 votes
3 answers
194 views

Transposition into KID

I have looked at many grandmaster games where White starts off with 1.c4, which later mostly transposes into a King's Indian. However, Black could have immediately played 1...e5, which seems slightly ...
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4 votes
1 answer
530 views

Hanham Variation Philidor Defense

I want to find a way of transposing into the Hanham Variation of the Philidor Defense, without a way for White to deviate. For example, in the normal move order, White may have the move 3. Bc4 or 3. ...
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3 votes
1 answer
298 views

Transposition Tables

Are transposition tables (in engines) used for one or multiple games? My current knowledge of transposition tables is that when an engine searches the game tree, there will sometimes be positions ...
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1 vote
1 answer
191 views

Is there a root tree of openings based on response by Black and vice versa?

I'm enjoying my study as a relative noob into chess (1000 rapid in Lichess and on Chess.com in the last month or so) and am getting very interested in openings. Is there a relative root tree that you ...
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2 votes
0 answers
104 views

Stockfish Transposition Table: 16 bit key equals 0 even if the key is found? [closed]

In Stockfish 11, they use the high 16 bits as key inside the cluster: const uint16_t key16 = key >> 48; // Use the high 16 bits as key inside the cluster This renders problem when key >> ...
3 votes
2 answers
174 views

How this game is denoted as French Advanced Variation?

I had started playing this game with Scandinavian Defense opening. How it is been denoted as French Advanced variation as of 3rd move. Please refer to the attached screen-shot.
8 votes
2 answers
1k views

1. e4 e6 2. d4 c5 - is this opening worth it?

While doing my spring cleaning, I came across an old book claiming to give a good opening chance for black. It's called the "Barcza-Larsen opening" and it is characterized by 2 .. c5: [fen ""] 1. e4 ...
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1 vote
1 answer
218 views

Most different openings by transpositions?

What sequence of opening moves can include most different named Openings or Defenses by transpositions? For example, I just played a bullet game that went: 1.d4 e5 2. e4 d6 3. Nf3 Nc6 4. Bb5. In ...
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3 votes
1 answer
184 views

Are there any sources of massive transposition tables?

Do transposition databases exist the way tablebases do? Would an engine be able to take advantage of a pre-calculated TD? Is there a benefit to players when studying if they had access to pre-...
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8 votes
1 answer
553 views

Why is 5...Be7 played before ...b5 in the main line of the Closed Ruy Lopez?

Here is what I've seen described as the main line of the Closed Ruy Lopez up to move 7: [fen ""] 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 (5... b5 6. Bb3 Be7 7. Re1 d6) 6. Re1 b5 7. Bb3 ...
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2 votes
1 answer
501 views

Opening classification and transpositions

Positions in an opening can often be reached in a variety of (meaningful) ways, i.e. by transpositions. When classifying chess games (e.g. in databases or books) by , are there rules or other ...
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6 votes
3 answers
881 views

Marshall Defense 1.d4 d5 2.c4 Nf6 — transpositions

I know that the theoretical refutation of 1.d4 d5 2.c4 Nf6?! is supposed to be 3.cxd5 Nxd5 4.Nf3. Perhaps Black doesn't fear the refutation because he intends a gambit such as 3.cxd5 c6?! or 3.cxd5 ...
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6 votes
1 answer
605 views

Three-fold repetition and null move

Added transposition table (this was tested alone and worked as expected), three fold repetition and null move pruning in my engine and wins more games but some of them end with three fold repetition ...
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2 votes
1 answer
154 views

multi PVs using triangular array

I am currently using a triangular array to collect the PV in my chess engine (written in C). However, I would like to return several variations such as the second best, third best, and so fourth. Is ...
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6 votes
1 answer
851 views

What are all the most common transpositions between the Caro-Kann Panov–Botvinnik Attack with 5...e6 6. Nf3 Bb4 and the Nimzo-Indian Defence?

I would like to know what are all the most frequent transpositions between the two following openings: . The Caro-Kann Panov–Botvinnik Attack with 5...e6 6. Nf3 Bb4: [StartPly "12"] [FEN ""] ...
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4 votes
5 answers
3k views

Why is it said that beginning with 1. Nf3 2. c4 avoids the Benoni but beginning with 1. d4 2. c4 does not?

I have read a lot of messages on different Forums about the merits of beginning with 1.Nf3 or beginning with 1.d4. And a very big number of people said essentially this: One of the advantages of ...
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2 votes
1 answer
250 views

Can the Nc3+e3 Chebanenko Slav, the Exchange Slav and the 4...Bg4 Slow Slav transpose into each other?

I would like to know if the following three variations can transpose into each other? The Nc3+e3 Chebanenko Slav: 1. d4 d5 2. c4 c6 3. Nc3 Nf6 4. e3 a6 The Exchange Slav: 1. d4 d5 2. c4 c6 3. cxd5 ...
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1 vote
1 answer
597 views

Is there any transposition available in between QGA and other openings?

I'm a chess player with ELO 1600. Now I'm trying to learn transpositions in chess. QGA is my favorite opening as white. But most of the time black chooses Queen's Gambit Declined. So now I'm trying to ...
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3 votes
1 answer
140 views

Kind of popular variation in Tournament

I am just an ordinary chess player who does not know about Chess Tournament even just a little thing, as I saw at my Houdini vs my Houdini at Tournament level in 5 minutes (and now I still testing in ...
9 votes
3 answers
952 views

How can one determine the opening or transposed opening from the existing pawn formation/structure?

I was once told that you can determine an opening or transposed opening just by how the pawns are structured on the board. Is this the method normally used to determine if an opening was transposed ...
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5 votes
2 answers
462 views

Can a set of moves be a transposition and a variation?

I am confused about the differences between a transposition and variation. I know that a transposition is when you start of with one opening and a set of moves after that leads to another opening and ...
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