MESON Chess Problem Database

Problem Display
PID: 65144 (r4r1R/1PRBb3/p3P3/K1PkN3/2N1p3/2p1P2p/b7/5Q1q w - - 0 1)

Shanshin, Valery Yurevich

1st Prize, Birnov MT, 1989

r4r1R/1PRBb3/p3P3/K1PkN3/2N1p3/2p1P2p/b7/5Q1q

#2

11 + 10

4827 FIDE Album (1989-1991) 1997

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf1
      • 2.bxa8Q#
      • 2.bxa8B#
    • 1...Rf2
      • 2.bxa8Q#
      • 2.bxa8B#
    • 1...Rf3
      • 2.bxa8Q#
      • 2.bxa8B#
    • 1...Rf4
      • 2.bxa8Q#
      • 2.bxa8B#
    • 1...Rf5
      • 2.bxa8Q#
      • 2.bxa8B#
    • 1...Rf6
      • 2.bxa8Q#
      • 2.bxa8B#
    • 1...Rf7
      • 2.bxa8Q#
      • 2.bxa8B#
    • 1...Bd8
      • 2.bxa8Q#
      • 2.bxa8B#
  • Tries
    • 1.Bc6+?
      • 1...Kxc5
        • 2.Sd7#
        • 2.Bxe4#
      • 1...Kxe6!
    • 1.Rh5?
      • threat
        • 2.Sb6#
      • 1...Bxc4
        • 2.Qxc4#
      • 1...Bxc5
        • 2.Sf7#
      • 1...Rf5
        • 2.bxa8Q#
        • 2.bxa8B#
      • 1...Bg5!
    • 1.Qf5?
      • threat
        • 2.Sb6#
      • 1...Rxf5
        • 2.bxa8Q#
        • 2.bxa8B#
      • 1...Bxc4
        • 2.Sf7#
      • 1...Bxc5
        • 2.Bc6#
      • 1...Qb1!
  • Keys
    • 1.Sf7!
      • threat
        • 2.Sb6#
      • 1...Rxf7
        • 2.bxa8Q#
        • 2.bxa8B#
      • 1...Bxc4
        • 2.Qf5#
      • 1...Bxc5
        • 2.Rh5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(j);N_GUARD,XQ(A)::PXR(i)=Q
    • R(j);N_GUARD::PXR(i)=Q
    • B(h);P_PINR(I),S_CUTR(j)::PXR(i)=Q
  • Tries
    • Try
      • B(J);CHECK
      • Refutation
        • K(f);S_FLIGHT,XP(G)
    • Try
      • R(K);
      • Threat
        • S(C)
      • Vars
        • B(b);OGATE,XS(C)::QAB1(A),XB(b)
        • B(h);N_GUARD,XP(E)::R(K)+S(F)
        • R(j);N_GUARD::PXR(i)=Q
      • Refutation
        • B(h);
    • Try
      • Q(A);
      • Threat
        • S(C)
      • Vars
        • R(j);N_GUARD,XQ(A)::PXR(i)=Q
        • B(b);SBLOCK,XS(C)::QAR(A)+S(F)
        • B(h);SBLOCK,XP(E)::B(J)
      • Refutation
        • Q(a);
  • Actual
    • S(F);
    • Threat
      • S(C)
    • Vars
      • R(j);N_GUARD,XS(F)::PXR(i)=Q
      • B(b);SBLOCK,XS(C)::QAR2(A)
      • B(h);N_GUARD,XP(E)::R(K)
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