MESON Chess Problem Database

Problem Display
PID: 139196 (4R3/B3nNp1/KR6/2N5/PP1k2bQ/4p3/B1P5/8 w - - 0 1)

Apro, Laszlo

The Problemist, 1937

4R3/B3nNp1/KR6/2N5/PP1k2bQ/4p3/B1P5/8

#2

11 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...g5
      • 2.Qh8#
    • 1...g6
      • 2.Qf6#
      • 2.Qh8#
  • Tries
    • 1.Se6+?
      • 1...Ke4
        • 2.Qxg4#
      • 1...Kc3!
    • 1.Rd6+?
      • 1...Sd5
        • 2.Se4#
      • 1...Kc3!
  • Keys
    • 1.Se4!
      • threat
        • 2.Re6#
      • 1...Be2+
        • 2.Rb5#
      • 1...Bc8+
        • 2.Rb7#
      • 1...Kxe4
        • 2.Qxg4#
      • 1...Be6
        • 2.Rb5#
        • 2.Rc6#
        • 2.Rd6#
        • 2.Rxe6#
        • 2.Rb7#
        • 2.Rbb8#
      • 1...Sd5
        • 2.Rd6#
      • 1...Sc6
        • 2.Rxc6#
      • 1...Sc8
        • 2.Rd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • P(e);OGATEB::QAB(E)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR2(E),XB(c)
      • Refutation
        • K(b);N_SPINB(c),S_FLIGHT
    • Try
      • R(H);CHECK
      • Vars
        • S(d);P_SPINS(d)::B(I)+S(F)
      • Refutation
        • K(b);N_SPINB(c),S_FLIGHT
  • Actual
    • S(F);N_PINB(c)
    • Threat
      • B(I)+R(H)
    • Vars
      • B(c);CHECK::B(I)+R(H)
      • K(b);OGATEB,P-FLIGHT,P_SPINB(c),P_SPINS(d),XS(F)::QAR2(E),XB(c)
      • S(d);::B(I)+R(H)
      • S(d);::B(I)+R(H),XS(d)
      • S(d);::B(I)+R(H),DCHECK
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