MESON Chess Problem Database

Problem Display
PID: 276396 (r1nRB3/2P2K1p/NqPp1p1r/RNPk4/1p3P2/3Pb3/1Q1n4/8 w - - 0 1)

Pituk, Alexander

diagrammes, 1979

r1nRB3/2P2K1p/NqPp1p1r/RNPk4/1p3P2/3Pb3/1Q1n4/8

#2

12 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc7+
      • 2.Sbxc7#
    • 1...Bd4
      • 2.Qxd4#
    • 1...Bxf4
      • 2.Qd4#
    • 1...Sb1
      • 2.Qg2#
      • 2.Qb3#
    • 1...Sf1
      • 2.Qg2#
      • 2.Qb3#
    • 1...Sb3
      • 2.Qg2#
      • 2.Qxb3#
    • 1...Sf3
      • 2.Qb3#
    • 1...Sc4
      • 2.Qg2#
    • 1...Se4
      • 2.Qb3#
    • 1...Sa7
      • 2.Rxd6#
    • 1...Se7
      • 2.Rxd6#
    • 1...f5
      • 2.Qe5#
  • Tries
    • 1.Qa2+?
      • 1...Sb3
        • 2.Qxb3#
        • 2.Qg2#
      • 1...Sc4
        • 2.Qxc4#
        • 2.Qg2#
      • 1...b3!
    • 1.Qb3+?
      • 1...Sc4
        • 2.Qxc4#
      • 1...Sxb3!
    • 1.Qxb4?
      • threat
        • 2.Sc3#
      • 1...Qxc7+
        • 2.Sbxc7#
        • 2.Saxc7#
      • 1...Bxf4
        • 2.Qd4#
      • 1...Bd4
        • 2.Qxd4#
      • 1...Sb1
        • 2.Qb3#
        • 2.Qc4#
        • 2.Qe4#
      • 1...Sc4
        • 2.Qxc4#
      • 1...Se4
        • 2.Qb3#
        • 2.Qc4#
        • 2.Qxe4#
        • 2.dxe4#
      • 1...Qxb5!
  • Keys
    • 1.Sxd6!
      • threat
        • 2.Sxc8#
      • 1...Qxc7+
        • 2.Sxc7#
      • 1...Sxd6+
        • 2.Rxd6#
      • 1...Qxc6
        • 2.Sxb4#
      • 1...Bxf4
        • 2.cxb6#
      • 1...Sc4
        • 2.dxc4#
      • 1...Se4
        • 2.dxe4#
      • 1...Sa7
        • 2.Sc8#
      • 1...Se7
        • 2.Sc8#
      • 1...f5
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 6
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • Q(e);CHECK,XP(I)::S(E),XQ(e)
    • B(b);N_GUARD::QAR1(A),XB(b)
    • B(b);N_GUARD,XP(C)::QAR1(A)
    • S(a);N_GUARD::QAB(A)
    • S(a);OGATE::QAB(A)
    • S(k);N_GUARD::R1(K),XP(f)
    • P(g);N_GUARD::QAR1(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Refutation
        • P(c);N_SPINP(f),P_SPINP(c)
    • Try
      • Q(A);CHECK
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::QAB1(A),XS(a)
      • Refutation
        • S(a);XQ(A)
    • Try
      • Q(A);XP(c)
      • Threat
        • S(E)
      • Vars
        • B(b);N_GUARD,XP(C)::QAR1(A)
        • B(b);N_GUARD::QAR1(A),XB(b)
        • S(a);N_GUARD::QAB1(A),XS(a)
      • Refutation
        • Q(e);XS(E)
  • Actual
    • S(E);XP(f)
    • Threat
      • R(K)+S(E),XS(k)
    • Vars
      • Q(e);CHECK,XP(I)::S(G),XQ(e)
      • S(k);CHECK,OGATE,P_SPINS(k),XS(E)::R1(K),XS(k)
      • Q(e);N_GUARD,XP(H)::S(G),XP(c)
      • B(b);N_GUARD,XP(C)::R(D)+P(F),XQ(e)
      • S(a);OGATE::P(B),XS(a)
      • S(k);::R(K)+S(E)
      • P(g);N_GUARD::QAR1(A)
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