MESON Chess Problem Database

Problem Display
PID: 287543 (3B4/1p3r1n/3R1q2/5k2/8/1BpR4/K4N1Q/8 w - - 0 1)

Purdon, AP

The Problemist, 1944

3B4/1p3r1n/3R1q2/5k2/8/1BpR4/K4N1Q/8

#2

7 + 6

6490 yacpdb 2026

SOLUTION

  • SOUND
  • Sets
    • 1...Qh4
      • 2.R3d5#
    • 1...Qg5
      • 2.R3d5#
    • 1...Qg7
      • 2.Rf3#
    • 1...Qxd8
      • 2.R3d5#
    • 1...Qh8
      • 2.Rf3#
    • 1...Qg6
      • 2.Rf3#
      • 2.R3d5#
    • 1...Qh6
      • 2.R3d5#
  • Tries
    • 1.R3d5+?
      • 1...Qe5
        • 2.Bc2#
        • 2.Rxe5#
        • 2.Qxe5#
      • 1...Kg6!
  • Keys
    • 1.Bc2!
      • threat
        • 2.R3d5#
      • 1...Kg5
        • 2.R3d5#
      • 1...Kg6
        • 2.Rg3#
      • 1...Qxd6
        • 2.Rxd6#
      • 1...Qd4
        • 2.Rf3#
        • 2.R3xd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • Q(c);N_GUARD::R(E)
    • Q(c);::R(E)
    • Q(c);N_GUARD,XB(G)::R(E)
  • Tries
    • Try
      • R(E);CHECK
      • Refutation
        • K(b);P_SPINQ(c),S_FLIGHT
  • Actual
    • B(D);
    • Threat
      • B(D)+R(E),DCHECK
    • Vars
      • K(b);P-FLIGHT,P_SPINQ(c)::R(E)
      • K(b);N_GUARD,P_SPINQ(c),S_FLIGHT::B(D)+R(E),DCHECK
      • Q(c);OGATE,XR(F)::B(D)+R(E),XQ(c)
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