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Forward Problems

In some positions, paradoxically, the existence of a mate depends upon the A1.3 rule. The idea here is that many game positions may correspond to a single problem position, yet in only one of these is the position legal, because only in that one game position can a mate be found.

So here are problems which share in common that forward play depends upon A1.3 They are mostly, but not all, concerned with castling and e.p.

Actually, this is not really a category in the sense of all the others. It's a meta-category, which would make use of other control mechanisms. e.g. #005 should really belong in the Stalemate in 1 category. Perhaps it will later, but for the moment this category will remain here.

kBR5/P1PP4/8/KRPP4/PQP5/5P2/8/8 w - - id #005 (*14*+1) DR. White to move. Place a White bishop on the board. Last move?;

8/8/4P1Q1/5B2/5PP1/1PP1kNP1/6P1/R3K2N w - - id #041 (13+1) DR. Mate in 2.; (Version of Diag 4 from the tutorial).

5b1k/p1p1p1pP/P1P1P1P1/KpP4p/8/7P/1P6/8 w - - id #042 (9+8) DR. White to move. Last move? Can White mate in 6? If Pb2 is on b3, and Ph3 is on h2, what then?

8/1P6/p7/P7/8/4N1PP/3PR1Pp/R3K1kr w - - id #044 (10+4) DR, White to move. Last move?WTM.LM? Can White mate in 1?

k1b5/1pPp4/pP1P4/P7/8/8/8/R3K3 w - - id #057 (6+5) DR, White to move. Last move?;

7k/6pP/6P1/3PpK2/1B2P3/8/8/8 w - - id #058 (6+3) DR. White to move. En passant OK?;

RBk5/KpPp4/bPpP4/1pP3Pp/1p5P/1P4p1/6P1/8 w - - id #059 (11+9) DR> White to move.
Last move? En passant OK?;

RBk5/KpPp4/bPpP4/1pP2Pp1/1p4P1/1P3p2/5P2/8 w - - id #059a (11+9) DR. Whose
move?; [A variant on #059: the 5-pawn "question-mark"-shaped cluster is shifted one
file.]

8/8/8/8/5P2/4PpPp/PP1PpPpp/R1B1K1kr w - - id #060 (10+7) DR. White to move. Last move? Castling rights?;

k1b5/1pPp4/1P1P4/1P5p/5P1P/5PNR/3NPBBQ/4K2R w - - id #061 (16+5) DR. White to move. Castling rights?;

8/1R2p1pB/4P1p1/R1PpKpP1/1PkBpP2/2P1P3/2P5/8 w - - id #062 (13+7) DR. White to
move. Last move? En passant OK?;

KBb1kb1r/PpPppppp/8/p7/8/8/8/8 w - - id #063 (4+11) DR. White to move. Last move?
Castling rights?;

7B/8/8/8/Q3P1P1/pPRP1p2/PpP2P2/brk1KR1R w - - id #066 (13+6) DR. White to move. Castling rights?;

2b1krbr/1pPp1p1n/3P1P1P/5PpK/6P1/8/8/8 w - - id #067 (7+10) DR. White to move. Last
move? En passant OK? Castling rights?;

B5 b1/5pBb/p4Pp1/P5P1/8/1PPPkNPN/Q1P5/R3K2R w - - id #068 (15+6) DR. White to
move. Last move? Castling rights?;

rrbK4/kp3q2/pb2p3/2Pp2p1/Pn1Pp1P1/4p1P1/4P1PB/5BRR w - - id #069 (12+14) DR. Richard Stanley version by Noam Elkies. Legal?;

3rk2r/b1p1p3/3pp2p/2ppKp2/4bP2/2n5/8/1q6 w - - id #070 (2+15) Noam Elkies. DR. Castling rights?;

6B1/8/8/2p5/1kP5/4P1P1/1PPbPP1P/R2NKN2 w - - id #071 (13+3) Noam Elkies. DR. White to move. Castling rights?;

r3k3/1b1p1p1p/2p2P1P/p4PKR/5PRQ/p4pPN/P4P1B/6B1 w - - id #072 (14+10) Noam Elkies version by Andrew Buchanan. DR. White to move. Last move? Castling rights?;

4k2r/1p4p1/1P5p/KP6/PP6/8/8/8 w - - id #073 (5+5) Noam Elkies. DR.White to move. Castling rights?;

8/8/8/8/8/1BPQ4/p1KR4/k1N5 w - - id #075 (6+2) DR. Stalemate?;

8/5PQ1/6P1/4B1P1/3P1PP1/4kP1N/B3P3/RN2K2R w - - id #082 (16+1) DR. Mate in 3. Castling rights?;