MESON Chess Problem Database

Problem Display
PID: 18880 (3Q4/3b4/3N2P1/2PkPp2/p2n1P2/B2R2K1/2B5/1R6 w - - 0 1)

Rudenko, Valentin Fedorovich

3rd Prize=, BCF, 1959

3Q4/3b4/3N2P1/2PkPp2/p2n1P2/B2R2K1/2B5/1R6

#2

11 + 5

3174 The Two-move Chess Problem Tradition and Development 1966

SOLUTION

  • SOUND
  • Sets
    • 1...Bc6
      • 2.Qg8#
    • 1...Be6
      • 2.Qa8#
  • Tries
    • 1.Sxf5?
      • 1...Kc4
        • 2.Se3#
      • 1...Ke4
        • 2.Rxd4#
      • 1...Kc6
        • 2.Se7#
      • 1...Ke6!
    • 1.Sc8?
      • 1...Kc4
        • 2.Sb6#
      • 1...Kc6
        • 2.Se7#
      • 1...Ke6
        • 2.Qg8#
      • 1...Ke4!
    • 1.Se8?
      • 1...Ke4
        • 2.Sf6#
      • 1...Kc6
        • 2.Qa8#
      • 1...Ke6
        • 2.Sc7#
      • 1...Kc4!
    • 1.Bb3+?
      • 1...Kc6
        • 2.Qb6#
      • 1...axb3!
    • 1.Rxd4+?
      • 1...Kc6
        • 2.Bxa4#
        • 2.Rb6#
        • 2.Qb6#
      • 1...Ke6
        • 2.Bxf5#
        • 2.Qf6#
      • 1...Kxd4!
    • 1.Qa8+?
      • 1...Bc6
        • 2.Qg8#
      • 1...Ke6!
    • 1.Qg8+?
      • 1...Be6
        • 2.Qa8#
      • 1...Kc6!
  • Keys
    • 1.Sb5!
      • 1...Kc4
        • 2.Rxd4#
      • 1...Ke4
        • 2.Sc3#
      • 1...Kc6
        • 2.Qa8#
      • 1...Ke6
        • 2.Sc7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • B(e);N_GUARD,SBLOCK::QAB(K)
  • Tries
    • Try
      • S(I);P_PINB(e),XP(d)
      • Vars
        • K(c);N_SPINB(e),N_SPINS(b),S_FLIGHT::S(I)
        • K(c);N_SPINB(e),N_SPINS(b),S_FLIGHT::B(B)+R(D),DCHECK,XS(b)
      • Refutation
        • K(c);N_SPINB(e),N_SPINS(b),S_FLIGHT
    • Try
      • S(I);P_PINB(e)
      • Vars
        • K(c);N_SPINB(e),N_SPINS(b),S_FLIGHT::S(I)
        • K(c);N_SPINB(e),N_SPINS(b),S_FLIGHT::QAB(K)
      • Refutation
        • K(c);N_SPINB(e),N_SPINS(b),S_FLIGHT
    • Try
      • S(I);P_PINB(e)
      • Vars
        • K(c);N_SPINB(e),N_SPINS(b),S_FLIGHT::S(I)
        • K(c);N_SPINB(e),N_SPINS(b),S_FLIGHT::QAB(K)
      • Refutation
        • K(c);N_SPINB(e),N_SPINS(b),S_FLIGHT
    • Try
      • B(B);CHECK
      • Vars
        • K(c);N_SPINS(b),S_FLIGHT::QAR1(K)
      • Refutation
        • P(a);XB(B)
    • Try
      • R(D);CHECK,XS(b)
      • Refutation
        • K(c);P-FLIGHT,XR(D)
    • Try
      • Q(K);CHECK
      • Vars
        • B(e);N_GUARD,P_SPINB(e),SBLOCK::QAB(K)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT
    • Try
      • Q(K);CHECK
      • Vars
        • B(e);N_GUARD,P_SPINB(e),SBLOCK::QAB(K)
      • Refutation
        • K(c);N_SPINS(b),S_FLIGHT
  • Actual
    • S(I);P_PINB(e)
    • Vars
      • K(c);N_SPINB(e),N_SPINS(b),S_FLIGHT::R1(D),XS(b)
      • K(c);N_SPINB(e),N_SPINS(b),S_FLIGHT::S(I)
      • K(c);N_SPINB(e),N_SPINS(b),S_FLIGHT::QAB(K)
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