[Retros] Programs for Solving Retro Problems

[Mario Richter]

Mark Tilford wrote:


> Does it also run into trouble with detecting an un-en passant?


No, with respect to 'un-en passant', 'Retractor' works correctly,
e.g. for

Nenad Petrovic
(XX)  problem 21-22  03/1954
    a   b   c   d   e   f   g   h
  +---+---+---+---+---+---+---+---+
8 | R | . | B | . |   | B |   | R | 8
  +---+---+---+---+---+---+---+---+
7 | . | K | . |*k | . |   | . |   | 7
  +---+---+---+---+---+---+---+---+
6 |   | . |   | P |   | . |   | . | 6
  +---+---+---+---+---+---+---+---+
5 | Q |   | . |   | . |   | . | Q | 5
  +---+---+---+---+---+---+---+---+
4 |   | . |   | . |   | Q |   | . | 4
  +---+---+---+---+---+---+---+---+
3 | B |   | . |   | . |   | . |   | 3
  +---+---+---+---+---+---+---+---+
2 | B | . |   | . |   | . |   | . | 2
  +---+---+---+---+---+---+---+---+
1 | B | B | . |   | . |   | N | N | 1  (15+1)
  +---+---+---+---+---+---+---+---+
    a   b   c   d   e   f   g   h

R1B2B1R/1K1k4/3P4/Q6Q/5Q2/B7/B7/BB4NN
Last 12 single moves?
w: Ra8 Bc8 Bf8 Rh8 Kb7 Pd6 Qa5 Qh5 Qf4 Ba3 Ba2 Ba1 Bb1 Ng1 Nh1
b: Kd7


or

Gianni Donati
R0003  StrateGems Vol.1  01-03/1998
For Emily

    a   b   c   d   e   f   g   h
  +---+---+---+---+---+---+---+---+
8 |   | . |   | . |   | . |   | . | 8
  +---+---+---+---+---+---+---+---+
7 |*p |*q |*k |*p |*p |   | . |   | 7
  +---+---+---+---+---+---+---+---+
6 |*p | . |   | . |   | . |   | . | 6
  +---+---+---+---+---+---+---+---+
5 |*p |*n | K |*b |*r |   | . |   | 5
  +---+---+---+---+---+---+---+---+
4 |*r | . |   | . |   | . |   | . | 4
  +---+---+---+---+---+---+---+---+
3 |*b |*p |*p |*p |*n |   | . |   | 3
  +---+---+---+---+---+---+---+---+
2 |   | . |   | . |   | . |   | . | 2
  +---+---+---+---+---+---+---+---+
1 | . |   | . |   | . |   | . |   | 1  (1+16)
  +---+---+---+---+---+---+---+---+
    a   b   c   d   e   f   g   h

8/pqkpp3/p7/pnKbr3/r7/bpppn3/8/8
Last 6 single moves?
w: Kc5
b: Pa7 Qb7 Kc7 Pd7 Pe7 Pa6 Pa5 Nb5 Bd5 Re5 Ra4 Ba3 Pb3 Pc3 Pd3 Ne3

the correct answers are given immediately, solving time 0.0 sec -
can you solve this problems as fast as 'Retractor'?  :-)

Regards,

  mario