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Results tagged with retrograde-analysis
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user 74049
Retrograde analysis is a technique employed to determine which events occurred leading up to a given situation.
7
votes
Accepted
What was White's last move?
Proof game (GIF)
Preliminary analysis
First of all, White’s last move must be Rh8xg8 (captured on a light square), but we must determine what was captured.
(When I say a “real” piece I mean the piec …
- 3,064
4
votes
Accepted
What were the last five moves?
One complete solution
Copy paste into https://lichess.org/paste to see it
1. Nf3 Nf6 2. Ne5 Ne4 3. Nf3 Ng5 4. Ne5 Nh3 5. gxh3 Nc6 6. Bg2 Na5 7. Bd5 Nb3 8. Kf1 Nxc1 9. Kg2 Nb3 10. Kf3 Nc5 11. Nd3 Ne6 1 …
- 3,064
6
votes
Accepted
Can you find the last 20 Moves?
Solution
The last 20 moves are:
You can see the proof game on Lichess here, or paste the position N7/Ppp5/rpp5/k7/B7/KPP2p2/pPP3P1/N7 and the solution into Retractor 2.
Reasoning
The crucial problem …
- 3,064
1
vote
Accepted
King and Pawn Endgame
Summary
The arrival of the pawns (that moved) to their final squares, from most recent to furthest in the past, are
I believe the minimum number of rook moves is
Proof game
My proof game is off by 1 …
- 3,064
2
votes
Accepted
Which piece moved last?
Solution
The piece that made the last move is
A possible way to reach this position is
Bd4xNa7 Nb5-a7 Ba7-d4+ Nd6-b5 Kg8-h8 Ne4-d6 Kh8-g8 Nf6-e4 f3-f4 Ng8-f6 g5-g6 Ne6-f8 g4-g5 Rf8-e8 f2-f3 Re8-d8 Qd …
- 3,064
3
votes
Accepted
What was the last capture in this game of monochromatic chess?
Solution
I chose not to use spoiler blocks, partly because it is too troublesome, partly because the text is so long that you couldn't accidentally spoil yourself.
Preliminaries
There are useful facts …
- 3,064
1
vote
Accepted
Chess 960 and retroanalysis
Let me solve the problem by considering that the retrograde history need not preserve castling rights. I believe there are
Recall that a Chess960 position is restricted by the following rules:
The K …
- 3,064