MESON Chess Problem Database

Problem Display
PID: 240745 (nQbkr1n1/R2q1PK1/3N4/1R3P2/1B4p1/8/8/4r3 w - - 0 1)

Segers, Marcel

Shakhmaty i Shashki, 1930

nQbkr1n1/R2q1PK1/3N4/1R3P2/1B4p1/8/8/4r3

#2

8 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ke7
      • 2.fxe8Q#
      • 2.fxe8R#
    • 1...Qxb5
      • 2.Qxc8#
    • 1...Qe7
      • 2.Qxc8#
    • 1...Qxf7+
      • 2.Sxf7#
    • 1...Sc7
      • 2.Sb7#
  • Tries
    • 1.Rc7?
      • threat
        • 2.Sb7#
      • 1...Qxf7+
        • 2.Sxf7#
      • 1...Ke7
        • 2.Sb7#
        • 2.fxe8Q#
        • 2.fxe8R#
      • 1...Qxb5
        • 2.Qxc8#
      • 1...Qxd6
        • 2.Qxc8#
      • 1...Qc6
        • 2.Qxc8#
      • 1...Qxc7!
    • 1.Qxc8+?
      • 1...Ke7
        • 2.Sc4#
        • 2.Se4#
        • 2.Sxe8#
        • 2.Rxd7#
        • 2.Qxd7#
        • 2.Qxe8#
        • 2.fxe8Q#
        • 2.fxe8R#
      • 1...Qxc8!
  • Keys
    • 1.Rd5!
      • threat
        • 2.Sb7#
      • 1...Qxf7+
        • 2.Sxf7#
      • 1...Ke7
        • 2.fxe8Q#
        • 2.fxe8R#
      • 1...Qxd6
        • 2.Rxd6#
      • 1...Qb7
        • 2.Sxb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • K(f);N_PINP(F),N_SPINB(e),P_SPINQ(c),S_FLIGHT::PXR(g)=Q
    • Q(c);N_GUARD,N_PINP(F),XR(B)::QAR1(H),XB(e)
    • Q(c);N_GUARD::QAR1(H),XB(e)
    • Q(c);CHECK,XP(F)::S(D),XQ(c)
    • S(d);S_CUTQ(c)::S(D)
  • Tries
    • Try
      • R(E);
      • Threat
        • S(D)
      • Vars
        • Q(c);CHECK,XP(F)::S(D),XQ(c)
        • Q(c);N_GUARD,N_PINP(F),XR(B)::QAR1(H),XB(e)
        • Q(c);N_GUARD,N_PINP(F),XS(D)::QAR1(H),XB(e)
        • Q(c);N_GUARD,N_PINP(F)::QAR1(H),XB(e)
      • Refutation
        • Q(c);XR(E)
    • Try
      • Q(H);CHECK,XB(e)
      • Refutation
        • Q(c);N_PINP(F),XQ(H)
  • Actual
    • R(B);
    • Threat
      • S(D)
    • Vars
      • Q(c);CHECK,XP(F)::R(B)+S(D),DCHECK,XQ(c)
      • K(f);N_PINP(F),N_SPINB(e),P_SPINQ(c),S_FLIGHT::PXR(g)=Q
      • Q(c);N_PINP(F),OGATE,P_SPINQ(c),XS(D)::R(B),XQ(c)
      • Q(c);::R(B)+S(D),DCHECK,XQ(c)
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