Timeline for What was Black's last move?
Current License: CC BY-SA 3.0
14 events
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| Feb 15, 2018 at 13:41 | comment | added | user1583209 | You don't even need to block with the king. You could also move the rook away somewhere. My point is that there are lots of possibilities and an answer/solution to such retro problem should IMO only include the moves that can be deduced with certainty. With certainty one can only say that the last move was king takes knight on h2. If you go back one move further you already end up with two options (which I can live with), there is not much point in figuring out all the different ways the king could have come to g1. | |
| Feb 15, 2018 at 13:35 | history | edited | Annatar | CC BY-SA 3.0 |
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| Feb 15, 2018 at 13:34 | comment | added | Annatar | @user1583209 Ah, fair enough. The white king can block too. More waiting moves with the queen though. | |
| Feb 15, 2018 at 13:32 | comment | added | user1583209 | No you don't need a blocking piece. See my edit above. | |
| Feb 15, 2018 at 13:31 | history | edited | user1583209 | CC BY-SA 3.0 |
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| Feb 15, 2018 at 11:44 | comment | added | Annatar | @user1583209 Yes I do need a blocking piece so that the black king can safely walk to g1 before the knight lands on f1. Distinguishing between forced and optional moves is not very productive, imo. Most of the "forced" moves are kinda optional anyways because pieces can be shuffled back and forth a few times for each move. | |
| Feb 15, 2018 at 11:18 | comment | added | user1583209 | I still think that you should make clear which moves are forced and which are optional. I believe in the first solution anything before Nxf1+ is optional to some extent. In the second solution you don't need a black blocking piece on the first row. | |
| Feb 15, 2018 at 11:07 | comment | added | Annatar | @user1583209 The moves before Nxf1+ show the safe paths of both the king but also the two knights (without (stale)mate) into the corner. And yes, the queens could also be rooks, obviously. | |
| Feb 15, 2018 at 11:03 | history | edited | Annatar | CC BY-SA 3.0 |
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| Feb 15, 2018 at 11:03 | comment | added | Annatar | @user1583209 Yes, there is more than one solution. Added another ;) | |
| Feb 15, 2018 at 10:43 | comment | added | user1583209 | Also, this only shows one of the two possible solutions. The other has a black piece on h2 which gets captured by the knight. | |
| Feb 15, 2018 at 10:42 | comment | added | user1583209 | But all the moves before Nxf1+ are random and also the black queen could be another black piece, right? | |
| Feb 15, 2018 at 10:21 | history | edited | Annatar | CC BY-SA 3.0 |
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| Feb 15, 2018 at 10:14 | history | answered | Annatar | CC BY-SA 3.0 |