MESON Chess Problem Database

Problem Display
PID: 67332 (4BBb1/K2p3p/4kbqP/5R1P/2Pp2NN/p6Q/5R2/4rr2 w - - 0 1)

Pilchenko, Viacheslav Karlovich

1st Prize, Rychkov/Stepanov MT, 1997

4BBb1/K2p3p/4kbqP/5R1P/2Pp2NN/p6Q/5R2/4rr2

#2

11 + 10

5417 FIDE Album (1995-1997) 2004
56 The Problemist 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxh5
      • 2.Rxf6#
    • 1...Qxe8
      • 2.Rxf6#
    • 1...d5
      • 2.cxd5#
  • Tries
    • 1.Se5?
      • threat
        • 2.Bxd7#
      • 1...Qxf5
        • 2.Qxf5#
      • 1...Qxe8
        • 2.Rg5#
      • 1...Rxe5
        • 2.Rxf6#
      • 1...Bxe5
        • 2.Rf6#
      • 1...Qf7
        • 2.Rg5#
      • 1...Qg7
        • 2.Rg5#
      • 1...d5
        • 2.Bd7#
      • 1...d6
        • 2.Bd7#
      • 1...Be7!
    • 1.Re2+?
      • 1...Be5
        • 2.Rfxe5#
      • 1...Rxe2!
    • 1.Qxa3?
      • threat
        • 2.Qd6#
      • 1...Qxe8
        • 2.Rxf6#
      • 1...Be5
        • 2.Qe7#
      • 1...Be7
        • 2.Qxe7#
      • 1...d6
        • 2.Qxd6#
      • 1...Ra1!
  • Keys
    • 1.Rd5!
      • threat
        • 2.Rd6#
      • 1...Qxe8
        • 2.Se5#
      • 1...Qxg4
        • 2.Qxg4#
      • 1...Be5
        • 2.Bxd7#
      • 1...Be7
        • 2.Bxd7#
      • 1...d6
        • 2.Rxd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • Q(g);N_GUARD,XP(G)::R1(F),XB(f)
    • Q(g);N_GUARD,XB(J)::R1(F),XB(f)
    • P(h);OGATE::P(C),XP(h)
  • Tries
    • Try
      • S(D);
      • Threat
        • B(J),XP(h)
      • Vars
        • Q(g);OGATE,P_SPINQ(g),XR(F)::QAB1(B),XQ(g)
        • Q(g);N_GUARD,XB(J)::QAB(B)+R(F)
        • R(a);SBLOCK,XS(D)::QAB(B)+R(F),DCHECK,XB(f)
        • B(f);SBLOCK,XS(D)::QAB(B)+R(F),DCHECK
        • Q(g);N_GUARD::QAB(B)+R(F)
        • P(h);::B(J)
      • Refutation
        • B(f);
    • Try
      • R(A);CHECK
      • Vars
        • B(f);N_GUARD,P_SPINB(f)::R1(F),XB(f)
      • Refutation
        • R(a);XR(A)
    • Try
      • Q(B);XP(c)
      • Threat
        • QAR1(B)
      • Vars
        • Q(g);N_GUARD,XB(J)::R1(F),XB(f)
        • B(f);N_GUARD::QAR1(B)
        • B(f);N_GUARD::QAR1(B),XB(f)
        • P(h);::QAR1(B),XP(h)
      • Refutation
        • R(a);P_PINQ(B)
  • Actual
    • R(F);
    • Threat
      • R1(F)
    • Vars
      • Q(g);N_GUARD,XB(J)::QAB(B)+S(D)
      • Q(g);OGATE,P_SPINQ(g),XS(D)::QAB(B),XQ(g)
      • B(f);::B(J),XP(h)
      • P(h);::R1(F),XP(h)
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