White to move.......

Zugzwang example

Sam Loyd

#2

Originally posted by BigDoggProblem
[b]Zugzwang example

Sam Loyd
[fen]2brrb2/8/p7/7Q/1p1kpPp1/1P1pN1K1/3P4/8 w - - 0 1[/fen]
#2
[/b]

1.Qa5!
1...Re7 (1...Rd6) 2.Qxb4#; 1...Be6(1...Be7) 2.Qe5#; 1...Bd6 (1...Bd7) 2.Qd5#; 1...Re6 (1...Rd7) 2.Nf5#, and lastly 1...Bc5 2.Qa1#

....and mate in two. An oldie but a goodie...



skeeter

Originally posted by skeeter
....and mate in two. An oldie but a goodie...

[fen]8/8/3B2p1/6K1/1PPkp3/2RnN2Q/8/nN6[/fen]

skeeter

1. Qh5!
1. ...Nc2 2. Nxc2#
1... Nb3 2. Nc2#
1... Nb2 2. Qh8#
1... Ne5 2. Bc5#
1... gxh5 2. Nf5#

Yep. that looks pretty right according to the notation here. Try this one:



skeeter

Originally posted by skeeter
Yep. that looks pretty right according to the notation here. Try this one:

[fen]8/5R2/1N2p1pK/4k1p1/nQ6/1N1q1B2/8/8/[/fen]

skeeter

Qd2

Originally posted by ilywrin
1.Qa5!
1...Re7 (1...Rd6) 2.Qxb4#; 1...Be6(1...Be7) 2.Qe5#; 1...Bd6 (1...Bd7) 2.Qd5#; 1...Re6 (1...Rd7) 2.Nf5#, and lastly 1...Bc5 2.Qa1#

Correct. This is a true zugzwang; if black could 'pass' after 1.Qa5, white would have no mate on the 2nd move.

Originally posted by Mephisto2
Qd2

Correct. This next one is a little harder:



skeeter

Originally posted by skeeter
Correct. This next one is a little harder:

[fen]3nbb2/Q1pr1pp1/B7/p1PP3p/K1Nk3r/1RN1RPP1/8/B7[/fen]

skeeter

1.Na3 seems to do the trick

Too good. Try this one:



skeeter

..and if you're all wondering about all the edits its because the site wouldn't allow me to 1KN1n etc after ....8/8/. I hade to code KN1n etc.

Anyone else have this problem?? Bug?

Originally posted by skeeter
Too good. Try this one:

[fen]4R3/1B7/8/8/1KN1n2r/5P2/1R1Pk2P/1Q7[/fen]

skeeter

..and if you're all wondering about all the edits its because the site wouldn't allow me to 1KN1n etc after ....8/8/. I hade to code KN1n etc.

Anyone else have this problem?? Bug?

1. Ne3 (threatens 2. Qf1# ) Nxd2+ 2. Ng4#

After any other move Qf1 mates.

Originally posted by skeeter

..and if you're all wondering about all the edits its because the site wouldn't allow me to 1KN1n etc after ....8/8/. I hade to code KN1n etc.

Anyone else have this problem?? Bug?

Perhaps you've added something in the first few rows:
e.g. 5N3B places the white bishop at b7
Check if your previous codes sum up to 8, if not that's the begining of the problem.
EDIT:
Problem found skeeter:
In you original fen the second row is: 1B7 which adds to 9 😉 It should be 1B6

I'll have to try if fen works without the /
e.g
84BrNkQK888895
Let's see:


EDIT: seems to work with digits only. Original try was 12BrNkQK45

Originally posted by skeeter
Yep. Xanthos has clearly blown his cover by posting the correct solution to the wrong position. Figures.

skeeter

Huh? I copied it into Chessbase, adding the 1 in the process as it wouldn't accept it as is (use reply and quote and copy paste to get at the FEN), and used that in working out the solution. I didn't turn on the engine, I just use it so I can move pieces around. Anyway for some reason oftentimes when I just cannot find the solution to a mate in X puzzle and I stick Fritz on it Fritz will find a mate in X+1 or something and stop looking.

I didn't notice that the position displayed is different from the one the FEN gives.