MESON Chess Problem Database

Problem Display
PID: 45155 (4K2b/8/8/2R2P2/R2Pk1p1/5qP1/2P1PPN1/7Q w - - 0 1)

Kopaev, Viacheslav Georgievich

Leun, Evgeny

6th Prize, Probleemblad, 1990

4K2b/8/8/2R2P2/R2Pk1p1/5qP1/2P1PPN1/7Q

#2

11 + 4

4827 FIDE Album (1989-1991) 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg2
      • 2.Qxg2#
    • 1...Qa3
      • 2.Se3#
    • 1...Qb3
      • 2.Se3#
    • 1...Qc3
      • 2.Se3#
    • 1...Qd3
      • 2.Se3#
      • 2.cxd3#
    • 1...Qe3
      • 2.Sxe3#
    • 1...Qf4
      • 2.Sxf4#
    • 1...Qxf5
      • 2.Sf4#
    • 1...Be5
      • 2.Rxe5#
  • Tries
    • 1.Qh6?
      • threat
        • 2.Qc6#
      • 1...Qxf5
        • 2.Qe3#
      • 1...Be5
        • 2.Rxe5#
      • 1...Qb3
        • 2.Qf4#
      • 1...Bf6!
    • 1.Qh7?
      • threat
        • 2.Qb7#
      • 1...Qxf5
        • 2.Qxf5#
      • 1...Qb3
        • 2.f6#
      • 1...Be5
        • 2.Rxe5#
        • 2.dxe5#
      • 1...Bg7!
    • 1.exf3+?
      • 1...gxf3
        • 2.Qe1#
        • 2.Qh4#
      • 1...Kxf3!
  • Keys
    • 1.Qb1!
      • threat
        • 2.Qb7#
      • 1...Qxf5
        • 2.c3#
      • 1...Be5
        • 2.Rxe5#
      • 1...Qb3
        • 2.cxb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 5
  • Sets
    • Q(a);OGATE,P_SPINQ(a),XS(E)::QAB(A),XQ(a)
    • Q(a);::QAB(A)+S(E)
    • Q(a);::QAB(A)+S(E),XQ(a)
    • Q(a);XP(J)::QAB(A)+S(E)
    • B(d);N_GUARD::R1(I),XB(d)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • Q(a);N_GUARD,XP(J)::QAR1(A)
        • B(d);N_GUARD::R1(I),XB(d)
        • Q(a);N_GUARD::QAR1(A)
      • Refutation
        • B(d);
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • Q(a);OGATE,P_SPINQ(a),XP(J)::QAB1(A),XQ(a)
        • Q(a);N_GUARD::QAB(A)+P(J)
      • Refutation
        • B(d);
    • Try
      • P(C);CHECK,XQ(a)
      • Refutation
        • K(b);S_FLIGHT,XP(C)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)
    • Vars
      • Q(a);N_GUARD,XP(J)::QAB(A)+P(B)
      • B(d);N_GUARD::R1(I),XB(d)
      • Q(a);OGATE::QAB(A)+P(B),XQ(a)
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