MESON Chess Problem Database

Problem Display
PID: 161867 (2Q3B1/B2r1r2/nn4R1/4PPp1/3PkPNR/1P2p1P1/4P3/3N1Kb1 w - - 0 1)

Apro, Laszlo

Banska Bystrica (BABY), 1961

2Q3B1/B2r1r2/nn4R1/4PPp1/3PkPNR/1P2p1P1/4P3/3N1Kb1

#2

15 + 8

15148 Sadier Collection 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd4
      • 2.Qc4#
    • 1...Kxf5
      • 2.Qc2#
    • 1...Rxd4
      • 2.Sc3#
    • 1...Sd5
      • 2.Qc2#
  • Tries
    • 1.Sc3+?
      • 1...Kxd4
        • 2.Qc4#
      • 1...Kxf5!
    • 1.Qc2+?
      • 1...Kxd4
        • 2.Qc4#
      • 1...Kd5!
    • 1.Qc6+?
      • 1...Kxd4
        • 2.Qc4#
      • 1...Kxf5
        • 2.Sh6#
        • 2.Rxg5#
        • 2.Qc2#
      • 1...Sd5
        • 2.Qc2#
      • 1...Rd5!
  • Keys
    • 1.fxg5!
      • threat
        • 2.Sgxe3#
      • 1...Rxf5+
        • 2.Sgf2#
      • 1...Kxd4
        • 2.Qc4#
      • 1...Kd5
        • 2.Sf6#
      • 1...Kxf5
        • 2.Qc2#
      • 1...Rxd4
        • 2.Sc3#
      • 1...Rh7
        • 2.Sh6#
      • 1...Sd5
        • 2.Qc2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(c);OGATEB,P-FLIGHT,P_SPINS(f),XP(F)::QAR1(N)
    • K(c);P_SPINR(g),S_FLIGHT,XP(K)::QAB(N)
    • R(g);SBLOCK,XP(F)::S(A)
    • S(f);SBLOCK::QAB(N)
  • Tries
    • Try
      • S(A);CHECK
      • Vars
        • K(c);P-FLIGHT,P_SPINS(f),XP(F)::QAR1(N)
      • Refutation
        • K(c);P_SPINR(g),S_FLIGHT,XP(K)
    • Try
      • Q(N);CHECK
      • Vars
        • K(c);OGATEB,P-FLIGHT,P_SPINS(f),XP(F)::QAR1(N)
      • Refutation
        • K(c);P_SPINR(h),S_FLIGHT
    • Try
      • Q(N);CHECK
      • Vars
        • K(c);OGATEB,P-FLIGHT,P_SPINS(f),XP(F)::QAR1(N)
        • S(f);P_SPINS(f),SBLOCK::QAB(N)
      • Refutation
        • R(g);P_SPINR(g)
  • Actual
    • P(G);P_SPINP(K),XP(d)
    • Threat
      • R(I)+S(H),XP(b)
    • Vars
      • R(h);CHECK,SBLOCK,XP(K)::R(I)+S(H),DCHECK
      • K(c);OGATEB,P-FLIGHT,P_SPINS(f),XP(F)::QAR1(N)
      • K(c);P_SPINR(h),S_FLIGHT::S(H)
      • K(c);P_SPINR(g),S_FLIGHT,XP(K)::QAB(N)
      • R(g);SBLOCK,XP(F)::S(A)
      • R(h);N_PINP(K)::R(I)+S(H)
      • S(f);SBLOCK::QAB(N)
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