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Up Topic The Rybka Lounge / Test Positions / Mate in 12
- - By ThudanBlunder (**) [gb] Date 2010-09-17 00:13 Edited 2010-09-17 00:45
8/2pPpP2/1P1qk1p1/1p4P1/1P4p1/1p1QK1P1/2PpPp2/8/ w
Attachment: Ring.jpg (55k)
Parent - By dcorbit (***) [us] Date 2010-09-17 01:04
Collection of mate in 12 positions:
http://cap.connx.com/EPD/dm12a.epd.bz2
Parent - - By Fulcrum2000 (****) [nl] Date 2010-09-17 16:59
8/2pPpP2/1P1qk1p1/1p4P1/1P4p1/1p1QK1P1/2PpPp2/8 w KQkq - 0 1
Parent - - By Geomusic (*****) Date 2010-10-26 04:11
pretty piece setup heh. something tells me knight underpromotes are coming
Parent - - By dcorbit (***) [us] Date 2010-10-26 09:15

2) f8=q; dm 12;        
    Searching move: f7-f8
    Best move (Magician): f7-f8Q
    Not found in: 10:00
     4/23  00:00        32.058  1.602.000  +6.44  Qd3xd6+ e7xd6 f7f8Q d2d1N+ Ke3d4
     5/23  00:00        34.576  1.646.000  +6.31  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 b3xc2 Qd8xe7+ Ke6d5 Qe7xd6+ Kd5c4
     6/23  00:00        35.753  1.625.000  +6.31  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 b3xc2 Qd8xe7+ Ke6d5 Qe7xd6+ Kd5c4
     7/23+  00:00        37.930  1.649.000  +6.57  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 b3xc2 Qd8xe7+ Ke6d5 Qe7xd6+ Kd5c4 Qf8f4+
     7/24+  00:00        38.997  1.695.000  +7.09  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 b3xc2 Qd8xe7+ Ke6d5 Qe7xd6+ Kd5c4 Qf8f7+ Kc4c3
     7/24  00:00        45.536  1.751.000  +7.63  Qd3xd6+ e7xd6 f7f8Q d2d1N+ Ke3d2 b3b2 b6xc7 b2b1Q Qf8e8+ Ke6d5 Qe8f7+ Kd5e5 d7d8Q
     8/24  00:00        53.256  1.775.000  +7.84  Qd3xd6+ c7xd6 f7f8Q d2d1N+ Ke3d2 Ke6xd7 c2xb3 Nd1b2 Qf8xf2 Kd7c6 Qf2f7
     9/28+  00:00        67.951  1.657.000  +8.16  Qd3xd6+ c7xd6 f7f8Q d2d1N+ Ke3d2 Ke6xd7 c2xb3 Nd1b2 Qf8xf2 Kd7c6 Qf2f7
     9/30+  00:00        85.685  1.862.000  +8.81  Qd3xd6+ c7xd6 f7f8Q d2d1N+ Ke3d2 Ke6xd7 c2xb3 Nd1b2 Qf8xf2 Kd7c6 Qf2f7 Kc6xb6 Qf7xg6 Kb6a6 Qg6e4
     9/30  00:00       107.883  2.035.000  +9.65  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 Qd1d4+ Kf2xf1 Qd4d1+ Kf1f2 Qd1d4+ Kf2g2 Qd4e4+ Kg2g1 Qe4d4+ Kg1h2 b3xc2 Qd8c8+ Ke6d5 Qc8xc2
    10/42+  00:00       182.959  2.376.000  +10.04  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 Qd1d4+ Kf2xf1 Qd4d1+ Kf1f2 Qd1d4+ Kf2g2 Qd4e4+ Kg2g1 Qe4d4+ Kg1h2 b3xc2 Qd8c8+ Ke6d5 Qc8xc2
    10/42+  00:00       270.547  2.601.000  +10.84  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 Qd1d4+ Kf2xf1 Qd4d1+ Kf1f2 Qd1d4+ Kf2g2 Qd4e4+ Kg2g1 Qe4e3+ Kg1f1 Qe3xg5 Qd8c8+ Ke6d5 Qf8f7+ Kd5d4 Qc8h8+ e7e5 Qf7xb3
    10/44  00:00       570.228  3.033.000  +11.39  Qd3xd6+ c7xd6 f7f8Q d2d1N+ Ke3d2 f2f1N+ Qf8xf1 Ke6xd7 Qf1xd1 Kd7c6 Qd1b1 b3xc2 Qb1xc2+ Kc6xb6 Qc2xg6 Kb6c7 Qg6e8 e7e5 Qe8xb5
    11/44+  00:00       668.381  1.132.000  +11.86  Qd3xd6+ c7xd6 f7f8Q d2d1N+ Ke3d2 f2f1N+ Qf8xf1 Ke6xd7 Qf1xd1 Kd7c6 Qd1b1 b3xc2 Qb1xc2+ Kc6xb6 Qc2xg6 Kb6c7 Qg6e8 e7e5 Qe8xb5
    11/44  00:00       685.238  1.147.000  +11.59  Qd3xd6+ c7xd6 f7f8Q d2d1N+ Ke3d2 f2f1Q Qf8xf1 Ke6xd7 Qf1xd1 b3b2 Qd1b1 Kd7c6 Qb1xb2 e7e5 Qb2a2 Kc6xb6 Qa2d5 Kb6c7 Qd5xb5 Kc7d8 Qb5b7
    12/44+  00:00       860.475  1.319.000  +12.07  Qd3xd6+ c7xd6 f7f8Q d2d1N+ Ke3d2 f2f1Q Qf8xf1 Ke6xd7 Qf1xd1 b3b2 Qd1b1 Kd7c6 Qb1xb2 e7e5 Qb2a2 Kc6xb6 Qa2d5 Kb6c7 Qd5xb5 Kc7d8 Qb5b7
    12/44  00:00     1.021.402  1.478.000  +12.50  Qd3xd6+ c7xd6 f7f8Q d2d1N+ Ke3d2 f2f1Q Qf8xf1 Ke6xd7 Qf1xd1 b3b2 Qd1b1 Kd7c6 Qb1xb2 e7e5 Qb2a2 Kc6xb6 Qa2d5 Kb6c7 Qd5xb5 Kc7d8 Qb5d3 Kd8d7 Qd3xg6
    13/44+  00:00     1.404.304  1.802.000  +13.02  Qd3xd6+ c7xd6 f7f8Q d2d1N+ Ke3d2 f2f1Q Qf8xf1 Ke6xd7 Qf1xd1 b3b2 Qd1b1 Kd7c6 Qb1xb2 e7e5 Qb2a2 Kc6xb6 Qa2d5 Kb6c7 Qd5xb5 Kc7d8 Qb5d3 Kd8d7 Qd3xg6
    13/44  00:00     1.590.555  1.923.000  +13.11  Qd3xd6+ c7xd6 f7f8Q d2d1N+ Ke3d2 f2f1Q Qf8xf1 Ke6xd7 Qf1xd1 b3b2 Qd1b1 Kd7c6 Qb1xb2 e7e5 Qb2a2 Kc6xb6 Qa2d5 Kb6c7 Qd5xb5 Kc7d8 Qb5b7 Kd8e8 Qb7c7 e5e4 Qc7c6+ Ke8f8 Qc6xe4
    14/44  00:01     2.134.769  2.230.000  +13.11  Qd3xd6+ c7xd6 f7f8Q d2d1N+ Ke3d2 f2f1Q Qf8xf1 Ke6xd7 Qf1xd1 b3b2 Qd1b1 Kd7c6 Qb1xb2 e7e5 Qb2a2 Kc6xb6 Qa2d5 Kb6c7 Qd5xb5 Kc7d8 Qb5b7 Kd8e8 Qb7c7 e5e4 Qc7c6+ Ke8f8 Qc6xe4
    15/44+  00:01     3.637.250  2.545.000  +13.65  Qd3xd6+ c7xd6 f7f8Q d2d1N+ Ke3d2 f2f1Q Qf8xf1 Ke6xd7 Qf1xd1 b3b2 Qd1b1 Kd7c6 Qb1xb2 e7e5 Qb2a2 Kc6xb6 Qa2d5 Kb6c7 Qd5xb5 Kc7d8 Qb5b7 Kd8e8 Qb7c7 e5e4 b4b5 e4e3+ Kd2xe3
    15/44+  00:02     5.596.065  3.020.000  +14.73  Qd3xd6+ c7xd6 f7f8Q d2d1N+ Ke3d2 f2f1Q Qf8xf1 Ke6xd7 Qf1xd1 b3b2 Qd1b1 Kd7c6 Qb1xb2 e7e5 Qb2a2 Kc6xb6 Qa2d5 Kb6c7 Qd5xb5 Kc7d8 Qb5b7 Kd8e8 Qb7c7 e5e4 b4b5 e4e3+ Kd2xe3
    15/51+  00:03    11.544.495  3.469.000  +17.88  Qd3xd6+ c7xd6 f7f8Q d2d1N+ Ke3d2 f2f1Q Qf8xf1 Ke6xd7 Qf1xd1 b3b2 Qd1b1 Kd7c6 Qb1xb2 e7e5 Qb2a2 Kc6xb6 Qa2d5 Kb6c7 Qd5xb5 Kc7d8 Qb5b7 Kd8e8 Qb7c7 Ke8f8 Qc7xd6+ Kf8f7 Qd6f6+ Kf7e8 Qf6xg6+ Ke8e7 Qg6f6+ Ke7d7 Qf6xe5
    15/55  00:06    21.329.856  3.635.000  +19.25  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 Qd1d4+ Kf2xf1 Qd4d1+ Kf1f2 Qd1d4+ Kf2g2 Qd4e4+ Kg2g1 Qe4e3+ Kg1f1 Ke6d5 Qd8a8+ Kd5c4 b6b7 Qe3c1+ Kf1g2 Qc1e3 Qa8c8+ Kc4xb4 Qc8xg4+ Kb4c3 c2xb3 Kc3b2 b7b8Q Qe3e5 Qb8a7 Qe5d5+ Qg4f3
    16/60+  00:07    29.009.797  3.834.000  +20.05  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 Qd1d4+ Kf2xf1 Qd4d1+ Kf1f2 Qd1d4+ Kf2g2 Qd4e4+ Kg2g1 Qe4e3+ Kg1f1 Ke6d5 Qd8a8+ Kd5c4 b6b7 Qe3c1+ Kf1g2 Qc1e3 Qa8c8+ Kc4xb4 Qc8xg4+ Kb4c3 c2xb3 Qe3e5 b7b8Q Kc3b2 Qb8a7 Qe5d5+ Qg4f3 Qd5xg5 Qf8xe7 Qg5xe7 Qa7xe7
    16/60+  00:10    40.921.483  3.883.000  +21.65  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 Qd1d4+ Kf2xf1 Qd4d1+ Kf1f2 Qd1d4+ Kf2g2 Qd4e4+ Kg2g1 Qe4e3+ Kg1f1 Ke6d5 Qd8a8+ Kd5c4 b6b7 Qe3c1+ Kf1g2 Qc1e3 Qa8c8+ Kc4xb4 Qc8xg4+ Kb4c3 c2xb3 Qe3e5 b7b8Q Kc3b2 Qb8a7 Qe5d5+ Qg4f3 Qd5xg5 Qf8xe7 Qg5xe7 Qa7xe7
    16/60  00:14    55.985.151  3.971.000  +23.14  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 Qd1d4+ Kf2xf1 Qd4d1+ Kf1f2 Qd1d4+ Kf2g2 Qd4e4+ Kg2g1 Qe4d4+ Kg1h2 Ke6d5 Qd8xe7 Kd5c4 Qe7f7+ Kc4c3 Qf7xb3+ Kc3d2 b6b7 Kd2e1 b7b8Q d6d5 Qb8xb5 Ke1d2 Qb5d3+ Qd4xd3 Qb3xd3+ Kd2e1 Qd3xg6 d5d4 b4b5
    17/64  00:20    82.577.116  4.099.000  +31.72  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 Qd1d4+ Kf2xf1 Qd4d1+ Kf1f2 Qd1d4+ Kf2g2 Qd4e4+ Kg2g1 Qe4e3+ Kg1f1 Ke6d5 Qd8a8+ Kd5c4 Qa8a3 e7e5 c2xb3+ Kc4c3 Qf8c8+ Qe3c5 b4xc5 d6d5 b6b7 b5b4 Qa3a1+ Kc3c2 Qa1a2+ Kc2c3 b7b8Q e5e4 Qc8h8+ d5d4
    18/64  00:24   102.292.087  4.159.000  +34.71  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 Qd1d4+ Kf2xf1 Qd4d1+ Kf1f2 Qd1d4+ Kf2g2 Qd4e4+ Kg2g1 Qe4e3+ Kg1f1 Ke6d5 Qd8a8+ Kd5c4 Qa8a3 Kc4d5 Qf8f7+ e7e6 Qa3a8+ Kd5d4 Qa8a1+ Kd4c4 Qf7c7+ Qe3c5 b4xc5 b5b4 Qa1a6+ Kc4c3 Qa6d3+ Kc3b2 Qd3xb3+ Kb2c1 c5xd6 e6e5 b6b7 e5e4 b7b8Q e4e3 Qb3xe3+ Kc1d1 Qb8xb4
    19/64  00:27   115.226.804  4.181.000  +M26  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 Qd1d4+ Kf2xf1 Qd4d1+ Kf1f2 Qd1d4+ Kf2g2 Qd4e4+ Kg2g1 Qe4e3+ Kg1f1 Ke6d5 Qd8a8+ Kd5c4 Qa8a3 Kc4d5 Qf8f7+ e7e6 Qa3a8+ Kd5c4 Qf7c7+ Qe3c5 Qa8e4+ Kc4c3 Qe4d3+ Kc3b2 Qd3xb3+ Kb2c1 b4xc5 e6e5 c5xd6 e5e4 b6b7 Kc1d1 b7b8Q b5b4 d6d7 e4e3 d7d8Q+ Kd1c1 Qb3xe3+ Kc1b2 Qb8xb4+ Kb2a2 Qc7a5+
    20/64  00:29   123.148.794  4.218.000  +M21  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 Qd1d4+ Kf2xf1 Qd4d1+ Kf1f2 Qd1d4+ Kf2g2 Qd4e4+ Kg2g1 Qe4d4+ Kg1h2 Ke6d5 Qd8xe7 Kd5c4 Qe7f7+ Kc4c3 Qf7xb3+ Kc3d2 b6b7 Qd4c4 Qf8xd6+ Kd2c1 Qb3a3+ Kc1xc2 Qd6xg6+ Kc2d1 Qg6b1+ Kd1d2 Qb1b2+ Qc4c2 Qa3c3+ Kd2xe2 Qc3xc2+ Ke2f3 Qc2e2+
    21/64  00:32   135.795.935  4.187.000  +M19  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 Qd1d4+ Kf2xf1 Qd4d1+ Kf1f2 Qd1d4+ Kf2g2 Ke6d5 Qf8xe7 Kd5c4 Qd8g8+ Kc4c3 Qg8xb3+ Kc3d2 b6b7 d6d5 b7b8Q Kd2e1 Qb3b1+ Qd4d1 Qb1xd1+ Ke1xd1 Qb8xb5 Kd1c1 Qe7e3+ Kc1b1 Qb5xd5 Kb1b2 Qd5b3+ Kb2a1 Qe3c1+
    22/64  00:36   151.456.205  4.209.000  +M17  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 Qd1d4+ Kf2xf1 Qd4d1+ Kf1f2 Qd1d4+ Kf2g2 Qd4e4+ Kg2g1 Qe4e3+ Kg1f1 Ke6d5 Qd8a8+ Kd5c4 Qf8c8+ Kc4xb4 Qa8a1 Qe3c5 c2c3+ Kb4c4 Qc8xg4+ Kc4d5 Qa1a8+ Qc5c6 Qa8g8+ Kd5c5 Qg4d4+
    23/64  00:39   169.039.633  4.275.000  +M17  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 Qd1d4+ Kf2xf1 Qd4d1+ Kf1f2 Qd1d4+ Kf2g2 Qd4e4+ Kg2g1 Qe4e3+ Kg1f1 Ke6d5 Qd8a8+ Kd5c4 Qf8c8+ Kc4xb4 Qa8a1 Qe3c5 c2c3+ Kb4c4 Qc8xg4+ Kc4d5 Qa1a8+ Qc5c6 Qa8g8+ Kd5c5 Qg4d4+
    24/64  00:47   206.741.978  4.351.000  +M17  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 Qd1d4+ Kf2xf1 Qd4d1+ Kf1f2 Qd1d4+ Kf2g2 Qd4e4+ Kg2g1 Qe4e3+ Kg1f1 Ke6d5 Qd8a8+ Kd5c4 Qf8c8+ Kc4xb4 Qa8a1 Qe3c5 c2c3+ Kb4c4 Qc8xg4+ Kc4d5 Qa1a8+ Qc5c6 Qa8g8+ Kd5c5 Qg4d4+
    25/64  00:58   259.128.397  4.459.000  +M17  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 Qd1d4+ Kf2xf1 Qd4d1+ Kf1f2 Qd1d4+ Kf2g2 Qd4e4+ Kg2g1 Qe4e3+ Kg1f1 Ke6d5 Qd8a8+ Kd5c4 Qf8c8+ Kc4xb4 Qa8a1 Qe3c5 c2c3+ Kb4c4 Qc8xg4+ Kc4d5 Qa1a8+ Qc5c6 Qa8g8+ Kd5c5 Qg4d4+
    26/64  01:21   368.593.546  4.522.000  +M17  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 Qd1d4+ Kf2xf1 Qd4d1+ Kf1f2 Qd1d4+ Kf2g2 Qd4e4+ Kg2g1 Qe4e3+ Kg1f1 Ke6d5 Qd8a8+ Kd5c4 Qf8c8+ Kc4xb4 Qa8a1 Qe3c5 c2c3+ Kb4c4 Qc8xg4+ Kc4d5 Qa1a8+ Qc5c6 Qa8g8+ Kd5c5 Qg4d4+
    27/64  01:52   520.088.343  4.629.000  +M17  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 Qd1d4+ Kf2xf1 Qd4d1+ Kf1f2 Qd1d4+ Kf2g2 Qd4e4+ Kg2g1 Qe4e3+ Kg1f1 Ke6d5 Qd8a8+ Kd5c4 Qf8c8+ Kc4xb4 Qa8a1 Qe3c5 c2c3+ Kb4c4 Qc8xg4+ Kc4d5 Qa1a8+ Qc5c6 Qa8g8+ Kd5c5 Qg4d4+
    28/64  02:52   811.744.290  4.720.000  +M17  Qd3xd6+ c7xd6 f7f8Q d2d1Q d7d8Q f2f1N+ Ke3f2 Qd1d4+ Kf2xf1 Qd4d1+ Kf1f2 Qd1d4+ Kf2g2 Qd4e4+ Kg2g1 Qe4e3+ Kg1f1 Ke6d5 Qd8a8+ Kd5c4 Qf8c8+ Kc4xb4 Qa8a1 Qe3c5 c2c3+ Kb4c4 Qc8xg4+ Kc4d5 Qa1a8+ Qc5c6 Qa8g8+ Kd5c5 Qg4d4+
    28/64  05:59  1.821.531.540  5.058.000  +M12  f7f8Q d2d1N+ Ke3d2 Qd6xd3+ e2xd3 Ke6xd7 b6b7 f2f1R Qf8xf1 b3xc2 b7b8Q Nd1c3 Kd2xc3 c2c1R+ Qf1xc1 c7c5 Qc1f4 c5xb4+ Qf4xb4 Kd7e6 Qb4b3+ Ke6f5 Qb8f4+
    29/64  06:44  2.053.394.068  5.077.000  +M12  f7f8Q d2d1N+ Ke3d2 Qd6xd3+ e2xd3 Ke6xd7 b6b7 f2f1R Qf8xf1 b3xc2 b7b8Q Nd1c3 Kd2xc3 c2c1R+ Qf1xc1 c7c5 Qc1f4 c5xb4+ Qf4xb4 Kd7e6 Qb4b3+ Ke6f5 Qb8f4+
    30/64  07:53  2.416.531,561  5.099.000  +M12  f7f8Q d2d1N+ Ke3d2 Qd6xd3+ e2xd3 Ke6xd7 b6b7 f2f1R Qf8xf1 b3xc2 b7b8Q Nd1c3 Kd2xc3 c2c1R+ Qf1xc1 c7c5 Qc1f4 c5xb4+ Qf4xb4 Kd7e6 Qb4b3+ Ke6f5 Qb8f4+
    31/64  09:53  3.041.940,540  5.123.000  +M12  f7f8Q d2d1N+ Ke3d2 Qd6xd3+ e2xd3 Ke6xd7 b6b7 f2f1R Qf8xf1 b3xc2 b7b8Q Nd1c3 Kd2xc3 c2c1R+ Qf1xc1 c7c5 Qc1f4 c5xb4+ Qf4xb4 Kd7e6 Qb4b3+ Ke6f5 Qb8f4+
   10/26/2010 2:03:20 AM, Time for this analysis: 00:10:00, Rated time: 20:00
Parent - - By Geomusic (*****) Date 2010-10-26 13:32 Edited 2010-10-26 13:38
wow promote to queen and underpromotes to rooks and knights did I read that right? just missing an underpromotion to bishop. Any chess positions out there that require, a rook, a knight and a bishop underpromotion?  If not I challenge you guys to make one!
Parent - - By Dadi Jonsson (Silver) [is] Date 2010-10-26 16:02

> Any chess positions out there that require, a rook, a knight and a bishop underpromotion?


Why not a queen promotion too? :smile: I located the following position with a CQL query in Aquarium. I found many more with queen, rook, bishop and knight promotions:

6r1/qP3P1P/1P3n2/1b6/6kB/6P1/7p/7K w - - 0 1
Parent - - By Geomusic (*****) Date 2010-10-26 16:43 Edited 2010-10-26 16:47
what is the mate in here? btw odd black piece placement its as if he wants white to mate him spectacularly ahaha !
Parent - - By Geomusic (*****) Date 2010-10-26 16:56
speaking of humorous things I had a funny game recently where it was threat of stalemate after opponent had trapped king and locked pawns he kept attacking my king with his unguarded rook and my king kept side stepping to avoid the stalemate LOL! Those types of games are always rude awakenings.
Parent - By ThudanBlunder (**) [gb] Date 2010-10-27 21:13
That is called a desperado rook.
:
Parent - - By dcorbit (***) [us] Date 2010-10-26 19:26
This is related to the even more complicated Babson task.  The underpromotions must happen for *both* sides and in sequence.
http://en.wikipedia.org/wiki/Babson_task
Parent - - By Geomusic (*****) Date 2010-10-26 21:21
Didn't even know there was such a project!
Parent - By ThudanBlunder (**) [gb] Date 2010-10-27 21:06
Also here.
:
Up Topic The Rybka Lounge / Test Positions / Mate in 12

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