I am black in the following game which contains the longest forced mate that I recall occuring in a game I have played at 11 moves, (or 21 plies). It turns out that I made a mistake on move 6 which allowed my opponent two moves later to sidestep the forced mate altogether. The correct line which was actually a forced mate in 10 moves, or 19 plies.
Ochja – Plantagenet
2m + 1s blitz – Playchess server
30th June 2007
1...Rxg2+ 2.Kxg2 Rg8+ 3.Kf3 Qh3+ The king must me prevented from escaping via e3. 4.Kf4 Rf8+ 5.Kg5 Qg2+ 6.Kh4 [6.Kh6 Rh8#] 6...Rf4+ This is my mistake which leads to an escape for my opponent in two moves. The correct move follows in brackets: [6...Qh2+ 7.Kg5 Rg8+ 8.Kh6 8...Qf4+ 9.Kh7 (9.Kxh5 Qg5#) 9...Qf7+ 10.Kh6 Qg6#] 7.Kxh5 Qh3+ 8.Kg5? At this point my opponent had an escape from any forced mates: [8.Kg6! There is no longer a forced mate, therefore 6...Rf4 is wrong and 6...Qh2+ is correct. 8...Qh8 Fritz's suggestion.] 8...Qh4+ 9.Kg6 Rf6+ 10.Kg7 Qh6+ [10...Qg5+ 11.Kh7 (11.Kh8 Rh6#) 11...Rh6#] 11.Kg8 Rf8#
Ochja – Plantagenet
2m + 1s blitz – Playchess server
30th June 2007
1...Rxg2+ 2.Kxg2 Rg8+ 3.Kf3 Qh3+ The king must me prevented from escaping via e3. 4.Kf4 Rf8+ 5.Kg5 Qg2+ 6.Kh4 [6.Kh6 Rh8#] 6...Rf4+ This is my mistake which leads to an escape for my opponent in two moves. The correct move follows in brackets: [6...Qh2+ 7.Kg5 Rg8+ 8.Kh6 8...Qf4+ 9.Kh7 (9.Kxh5 Qg5#) 9...Qf7+ 10.Kh6 Qg6#] 7.Kxh5 Qh3+ 8.Kg5? At this point my opponent had an escape from any forced mates: [8.Kg6! There is no longer a forced mate, therefore 6...Rf4 is wrong and 6...Qh2+ is correct. 8...Qh8 Fritz's suggestion.] 8...Qh4+ 9.Kg6 Rf6+ 10.Kg7 Qh6+ [10...Qg5+ 11.Kh7 (11.Kh8 Rh6#) 11...Rh6#] 11.Kg8 Rf8#
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