MESON Chess Problem Database

Problem Display
PID: 230401 (2n1RB2/4QKPn/3PP3/1N2k3/4P1R1/6P1/b4P2/8 w - - 0 1)

Petkov, Petko Andonov

Deutsche Schachzeitung, 1959

2n1RB2/4QKPn/3PP3/1N2k3/4P1R1/6P1/b4P2/8

#2

12 + 4

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bxe6+
      • 2.Qxe6#
    • 1...Sg5+
      • 2.Qxg5#
    • 1...Sf6
      • 2.Qxf6#
    • 1...Sxf8
      • 2.Qg5#
      • 2.Qf6#
    • 1...Sxd6+
      • 2.Qxd6#
  • Keys
    • 1.Qb7!
      • threat
        • 2.f4#
      • 1...Bxe6+
        • 2.Rxe6#
      • 1...Sg5+
        • 2.Rxg5#
      • 1...Sxd6+
        • 2.Bxd6#
      • 1...Bd5
        • 2.Qxd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • B(a);CHECK,OGATE,P_SPINB(a),XP(G)::QAR1(H),XB(a)
    • S(c);CHECK,N_GUARD::QAR2(H),XS(c)
    • S(c);N_GUARD::QAB1(H),XS(c)
    • S(d);CHECK,OGATE,XP(F)::QAB1(H),XS(d)
  • Actual
    • Q(H);
    • Threat
      • P(A)
    • Vars
      • B(a);CHECK,OGATE,P_SPINB(a),XP(G)::R1(K),XB(a)
      • S(c);CHECK,N_GUARD::R(D),XS(c)
      • S(d);CHECK,OGATE,XP(F)::B(L),XS(d)
      • B(a);N_GUARD::QAR1(H),XB(a)
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