Author: Omid David Tabibi
Date: 03:33:03 01/10/03
Go up one level in this thread
On January 10, 2003 at 06:12:15, Uri Blass wrote: >On January 10, 2003 at 05:35:01, Omid David Tabibi wrote: > >>On January 10, 2003 at 04:57:50, Uri Blass wrote: >> >>>On January 10, 2003 at 04:55:17, Omid David Tabibi wrote: >>> >>>>>Your positions are illegal. >>>>> >>>>>In the first position there are 32 pieces on the board and it means that there >>>>>were no captures so there were no promotions and it is impossible to have it >>>>>when the number of white queens is bigger than 1. >>>>> >>>>>In the second and third position there are 30 pieces but it is easy to prove >>>>>that all the white pawns need to promote to get 8 white queens and 2 white >>>>>bishops with the same color. >>>>> >>>>>It is impossible to promote 8 pawns when only 2 capture are allowed because >>>>>every capture can open at most 2 new files for promotion. >>>>> >>>> >>>> >>>>[D]k1K5/8/8/8/8/8/7P/6B1 w - - 0 1 >>>>White to move. >>>> >>>>Is the above position legal? If so, what were the last two moves? >>>> >>>> >>>>Source: The Chess Mysteries of Sherlock Holmes, by Raymond Smullyan. >>> >>>Na8+ Kxa8 >>> >> >>Another interesting position: >> >>[D]1n2k3/p1pqppp1/1p1p1n2/3N2p1/1PB3bP/2P1PN2/1P1P1PP1/2BQK2R w - - 0 1 >> >>Can white castle? > > >No > >The rook at h1 moved from a1 > >The black pawn at g5 captured something and it has to be a rook. >It cannot be the rook a1 because in that case white needs to capture something >by a pawn to let the rook at a1 move to g5 and it is impossible because the only >candidate are bishop at f8 and rooks when the bishop at f8 could not move and >needed to be captured by a knight and the rooks black cannot be captured by a >pawn before hxg5. > >Here is the game that I composed to prove that the position is legal. > > >1.h2-h4 h7-h6 2.Rh1-h3 d7-d6 3.Rh3-g3 Bc8-d7 4.Rg3-g5 h6xg5 5.Ng1-f3 Rh8-h6 >6.Nf3-e5 Rh6-f6 7.Ne5-g6 Rf6-f5 8.Ng6xf8 Rf5-b5 9.Nf8-e6 Rb5-b4 10.a2-a3 Bd7-c6 >11.Ne6-f4 Bc6-d7 12.Nf4-d5 Bd7-c6 13.Nd5-b6 Bc6-d7 14.Nb6xa8 Bd7-c6 15.Na8-b6 >Bc6-d7 16.Nb6-d5 Bd7-g4 17.a3xb4 Ng8-f6 18.Ra1-a3 b7-b6 19.Ra3-h3 Nf6-g8 >20.c2-c3 Ng8-f6 21.e2-e3 Nf6-g8 22.Bf1-c4 Ng8-f6 23.Rh3-h1 Qd8-d7 24.Nb1-a3 >Qd7-d8 25.Na3-c2 Qd8-d7 26.Nc2-d4 Qd7-d8 27.Nd4-f3 Qd8-d7 Line > Nice analysis. These were two "easy" positions from Smullyan's book. It is an old book and out of print, but its positions are available online at http://janko.at/Schach/Smullyan-SH though you will need a German-English translator! If someone finds a website with the solutions available, please let me know. > > >Uri
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