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Puzzle 8

Posted: Tue Mar 21, 2017 7:59 am
by Hagbard
Copenhagen Hnefatafl. White wins in 6 moves. How?

Re: Puzzle 8

Posted: Fri Jun 02, 2017 1:15 am
by jrton80
I am assuming that's 6 white moves moving the King only:
White K4-A4, Black C2-A2, White A4-A3, Black J2-A2, White A3-D3, Black A2-A3 (failure to do this will result in 2 moves to escape at A1), White D3-D10, and from there it is 2 moves to escape at A11 or K11 which cannot be stopped

Re: Puzzle 8

Posted: Fri Jun 02, 2017 4:13 pm
by Hagbard
That's right!

Re: Puzzle 8

Posted: Mon May 04, 2020 2:54 pm
by Brandon_Error404
1. ... ________ K4-A4
2. E2-A2 _____ A4-A3xA2
3. J2-A2 _____ A3-H3
4. F1-F3 _____ H3-H10
5. E11-E10* __ H10-K10
6. J3-J10* ____ K10-K11++
White moves the king to A4, to which black has no other option than to respond by moving E2 to A2 or lose immediately after.
The piece is captured against the corner by the king, again leaving black with no alternative than to move J2 to A2.

Now the king moves away to H3. If black were to prevent the king from going to row 10 he'll just move back to A3, capturing the black piece on A2 and leaving the way towards victory open.
Black would have lost in 5 moves, but he can do a little better. Delaying the inevitable to 6 turns.

In move 4 black prevents losing the piece on A2. I've written F1 to F3 as it leaves the least amount of space for the king to move, but it doesn't really matter.
The king now has a clear path to row 10 where he can go to either corner and escape.

All black can do is chose which corner that will be. Chosing to block of the path to A10 means it'll be K10. Where black can move J3 next to the king and lament how that would be a win for black if the game was played with different rules than Copenhagen rules.