March 2003

R194 -

[1kr3n1/p2np3/1p3p2/q2pbrp1/6bp/2N1P3/PP3PPP/R1BQK1NR]

Solution

R195 -

15+15. Shortest proof game in 16.5 moves (C+)

[2k2nr1/pppn1b1p/1qp1ppp1/8/3b4/4P3/PPPP1PPP/RNB1KBNR]

Solution

R196 -

6+16. Shortest proof game in 25.0 moves

[6rn/4pp1n/3p1rpp/p1pk4/1p6/8/3N4/RqbQKbNR]

Solution

R197 -

14+15. Shortest proof game in 27.5 moves

[2R3kr/n5pp/b4ppb/pp5q/P7/nBpP4/NP3PPP/rN1QKB1R]

Solution

R198 -

10+7/8. A black bishop is missing. Drawn by repetition. (a) Add the missing bishop and prove there is only one legal square for it. (b) Give the moves of the shortest possible repetition loop.

Drawn: A position is drawn if (a) this position (pieces and move possibilities in the position) occurs for the third time; or (b) 100 half-moves have passed without a capture, a pawn move, or castling. This ends the game immediately. [I.e. if a position is drawn, either the last move is the first time a 3-fold repetition occurs, or it was the 100th half-move without capture, pawn move or castling]

[8/8/6p1/1p6/7P/1P2pP1p/pPPPP1PK/1b2k2R]

Solution

R199 -

11+12. Drawn. Which rule is used? [3-fold repetition or 50-move rule] (a) Diagram (b) Ba7->Sa7

Drawn: A position is drawn if (a) this position (pieces and move possibilities in the position) occurs for the third time; or (b) 100 half-moves have passed without a capture, a pawn move, or castling. This ends the game immediately. [I.e. if a position is drawn, either the last move is the first time a 3-fold repetition occurs, or it was the 100th half-move without capture, pawn move or castling]

[8/bp1B1p2/bP1P4/Pk1p1Pp1/3pP1Pp/1ppK2Br/4P2P/8]

Solution

R183c -

12+10. What was the position 11 half-moves ago?

[2b5/pp1pppp1/1N4p1/QP6/P2R4/1kBP4/1p1PP3/RNK5]

Solution

R184c -