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'''[[Main Page|Home]] * [[Engine Testing]] * [[Test-Positions]] * Null Move Test-Positions'''
Test-positions where [[Null Move Pruning|Null Move]] may fail due to [[Zugzwang|zugzwang]]:
<pre>
8/8/p1p5/1p5p/1P5p/8/PPP2K1p/4R1rk w - - 0 1 bm Rf1; id "zugzwang.001";
1q1k4/2Rr4/8/2Q3K1/8/8/8/8 w - - 0 1 bm Kh6; id "zugzwang.002";
7k/5K2/5P1p/3p4/6P1/3p4/8/8 w - - 0 1 bm g5; id "zugzwang.003";
8/6B1/p5p1/Pp4kp/1P5r/5P1Q/4q1PK/8 w - - 0 32 bm Qxh4; id "zugzwang.004";
8/8/1p1r1k2/p1pPN1p1/P3KnP1/1P6/8/3R4 b - - 0 1 bm Nxd5; id "zugzwang.005";
</pre>
=See also=
* [[Null Move Pruning Test Results]]
=Forum Posts=
* [https://www.stmintz.com/ccc/index.php?id=210702 Crafty-IsiChess,CCT4,r11 ==> A move to avoid?] by [[José Antônio Fabiano Mendes]], [[CCC]], January 29, 2002
* [https://www.stmintz.com/ccc/index.php?id=282362 endgame position - null move problem] by [[Jon Dart]], [[CCC]], February 06, 2003
* [http://www.talkchess.com/forum/viewtopic.php?t=58316 static mate/stalemate detection?] by [[Alexandru Mosoi]], [[CCC]], November 21, 2015
'''[[Test-Positions|Up one level]]'''
Test-positions where [[Null Move Pruning|Null Move]] may fail due to [[Zugzwang|zugzwang]]:
<pre>
8/8/p1p5/1p5p/1P5p/8/PPP2K1p/4R1rk w - - 0 1 bm Rf1; id "zugzwang.001";
1q1k4/2Rr4/8/2Q3K1/8/8/8/8 w - - 0 1 bm Kh6; id "zugzwang.002";
7k/5K2/5P1p/3p4/6P1/3p4/8/8 w - - 0 1 bm g5; id "zugzwang.003";
8/6B1/p5p1/Pp4kp/1P5r/5P1Q/4q1PK/8 w - - 0 32 bm Qxh4; id "zugzwang.004";
8/8/1p1r1k2/p1pPN1p1/P3KnP1/1P6/8/3R4 b - - 0 1 bm Nxd5; id "zugzwang.005";
</pre>
=See also=
* [[Null Move Pruning Test Results]]
=Forum Posts=
* [https://www.stmintz.com/ccc/index.php?id=210702 Crafty-IsiChess,CCT4,r11 ==> A move to avoid?] by [[José Antônio Fabiano Mendes]], [[CCC]], January 29, 2002
* [https://www.stmintz.com/ccc/index.php?id=282362 endgame position - null move problem] by [[Jon Dart]], [[CCC]], February 06, 2003
* [http://www.talkchess.com/forum/viewtopic.php?t=58316 static mate/stalemate detection?] by [[Alexandru Mosoi]], [[CCC]], November 21, 2015
'''[[Test-Positions|Up one level]]'''
