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Up Topic The Rybka Lounge / Test Positions / Four winning plans (Sting.Iq.14)
- By user923005 (****) Date 2019-02-07 19:44
I think that this is the most difficult position from the Sting problem set.  There are four winning plans, all of which are permutations.  How long does it take your favorite program to find a score bigger than +5 pawns?

1qN5/b1pB4/1pP2k2/pP3P2/P1P5/8/8/K7 w - - acd 69/72;
acs 4403 ; acn 76452133136; ce 914 ; bm Ka2; pv Ka2 Ke5 Kb2 Qa8 Be6 Qb8 Kb3 Qa8 Kc2 Bb8 Kc3 Kf6 Kb2 Kg7 Kb3 Kh7 Kc2 Ba7 Kc3 Kg7 Kd2 Kh7 Kc2 Qb8 Bd7 Kh8 Kd2 Qa8 Ke2 Qb8 Be6 Qa8 Kd3 Kg7 Ke3 Bb8 Kd4 Kf6 Ke4 Ba7 Kf4 Qb8 Ke3 Kg5 Kd2 Kh6 Kd3 Kg5 Kc2 Qa8 Bd7 Kf6 Kd3 Kg7 Ke3 Qb8 Kf3 Kf8 Ke4 Kg7 Ke5 Kf7 f6 Qa8 Be6+ Ke8 Kf5;

1qN5/b1pB4/1pP2k2/pP3P2/P1P5/8/8/K7 w - - acd 69/76;
acs 4403 ; acn 76452133136; ce 914 ; bm Kb2; pv Kb2 Qa8 Be6 Kg5 Kc3 Qb8 Kd4 Kf6 Kd5 Qa8 Bd7 Bb8 Ke4 Ba7 Kf4 Bb8 Be6 Ba7 Ke3 Bb8 Ke4 Qa7 Kf3 Qa8 Kg4 Ba7 Kf4 Qb8 Bd7 Qa8 Ke4 Qb8 Ke3 Kg5 Kd3 Qa8 Be6 Kf6 Kc3 Qb8 Kd2 Kg5 Kc1 Kh6 Kc2 Kh5 Kd1 Qa8 Kd2 Bb8 Kd3 Kg5 Kc2 Kf6 Kb2 Kg7 Kb3 Kh7 Kc2 Ba7 Kc3 Kg7 Bd7 Kf7 Kc2 Kf6 Kb2 Ke5 Be6 Qb8 Kb1 Qa8 Kc2 Bb8 Kc3;

1qN5/b1pB4/1pP2k2/pP3P2/P1P5/8/8/K7 w - - acd 69/77;
acs 4403 ; acn 76452133136; ce 914 ; bm Be6; pv Be6 Qa8 Kb2 Kg5 Kc3 Qb8 Kd4 Kf6 Ke3 Kg5 Ke4 Kf6 Bd7 Qa8 Kd3 Kg7 Be6 Kf6 Ke3 Bb8 Ke4 Ba7 Kd3 Ke5 Kc2 Bb8 Kc3 Kf6 Kb2 Kg7 Kb3 Kh7 Kc2 Ba7 Kc3 Kg7 Kd2
Kh7 Kc2 Qb8 Bd7 Kh8 Kd2 Qa8 Ke2 Kh7 Kf3 Kh6 Ke4 Bb8 Ke5 Kg7 Ne7 Kh7 f6 Kh6 Bc8 Ba7 Ke6 Kh7 Kd7 Kh6 f7 Kg7 Ke8;

1qN5/b1pB4/1pP2k2/pP3P2/P1P5/8/8/K7 w - - acd 69/78;
acs 4403 ; acn 76452133136; ce 914 ; bm Kb1; pv Kb1 Kg5 Kb2 Kf6 Kb3 Kg5 Be6 Kh6 Kc2 Kh5 Kd2 Kh6 Ke2 Kh5 Kf3 Kg5 Ke4 Kf6 Kd4 Qa8 Kd5 Qb8 Ke4 Qa8 Kd4 Qb8 Bd7 Qa8 Kd3 Ke5 Be6 Qb8 Ke2 Kf6 Kd2 Kg5 Kd3 Kf6 Kc2 Kg7 Bd7 Qa8 Kc3 Kf7 Be6+ Kg7 Kb2 Kh8 Bd7 Kh7 Kc3 Kg7 Be6 Bb8 Kb3 Kh7 Kc2 Ba7 Kd2 Bb8 Kd3 Kg7 Ke3 Kf8 Ke4 Ke8 Ke5 Ba7 f6 Kf8 Kf5 Ke8 Kg6 Kf8 Bf5 Ke8 Bd7+ Kf8;
Up Topic The Rybka Lounge / Test Positions / Four winning plans (Sting.Iq.14)

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