MESON Chess Problem Database

Problem Display
PID: 64345 (2kr1BQK/1R6/P3n3/8/2b1N1R1/7B/8/8 w - - 0 1)

Biscay, Pierre

Sp. Prize, Die Schwalbe, 1935

2kr1BQK/1R6/P3n3/8/2b1N1R1/7B/8/8

#2

8 + 4

81 Chess 1947
274 diagrammes 1974
5454 Near Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sf4
      • 2.Qxc4#
    • 1...Sg5
      • 2.Qxc4#
    • 1...Sg7
      • 2.Qxc4#
    • 1...Sxf8
      • 2.Qxc4#
  • Tries
    • 1.Qxe6+?
      • 1...Rd7
        • 2.Qxd7#
      • 1...Bxe6!
  • Keys
    • 1.Be7!
      • threat
        • 2.Sd6#
      • 1...Rxg8+
        • 2.Rxg8#
      • 1...Sc7
        • 2.Qxd8#
      • 1...Sf8
        • 2.Qxc4#

This anticipates 133177(1986)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • S(b);OGATE::QAR(G),XB(a)
    • S(b);OGATE,XB(F)::QAR(G),XB(a)
  • Tries
    • Try
      • Q(G);CHECK,P_SPINB(F),XS(b)
      • Vars
        • R(d);N_GUARD,N_PINB(F),P_SPINR(d)::QAB1(G),XR(d)
      • Refutation
        • B(a);XQ(G)
  • Actual
    • B(F);P_PINR(d),P_SPINQ(G)
    • Threat
      • S(B)
    • Vars
      • R(d);CHECK,N_SPINR(d),OGATE,XQ(G)::R(C),XR(d)
      • S(b);N_GUARD::QAR1(G),XR(d)
      • S(b);N_PINQ(G),N_SPINR(d)::QAR(G),XB(a)
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