MESON Chess Problem Database

Problem Display
PID: 67219 (4RBKn/1pp5/5p2/N2kP3/2RNrp2/4pp2/b1n1B3/7Q w - - 0 1)

Lukyanov, Valentin Volodimirovich

HM., Olympic Ty., 1984

4RBKn/1pp5/5p2/N2kP3/2RNrp2/4pp2/b1n1B3/7Q

#2

9 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Sxd4
      • 2.Rc5#
    • 1...fxe5
      • 2.Rd8#
  • Tries
    • 1.Qd1?
      • threat
        • 2.Rc5#
      • 1...Rxd4
        • 2.Bxf3#
      • 1...Rxe5
        • 2.Sxc2#
      • 1...Bxc4
        • 2.Bxc4#
      • 1...c5
        • 2.Rxc5#
      • 1...b6!
    • 1.Qh5?
      • threat
        • 2.Rd8#
      • 1...Rxd4
        • 2.exf6#
      • 1...Rxe5
        • 2.Bxf3#
      • 1...Sxd4
        • 2.Rc5#
      • 1...Sf7
        • 2.Qxf7#
      • 1...f5!
  • Keys
    • 1.Qh7!
      • threat
        • 2.Qd7#
      • 1...Rxd4
        • 2.Rc5#
      • 1...Rxe5
        • 2.Rd8#
      • 1...Sf7
        • 2.Qxf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • S(b);SBLOCK,XS(D)::R1(C)
    • P(h);SBLOCK,XP(F)::R(G)
  • Tries
    • Try
      • Q(A);
      • Threat
        • R1(C)
      • Vars
        • R(e);OGATEB,P_SPINR(e),XS(D)::B(B),XP(d)
        • R(e);N_GUARD,XP(F)::QAR(A)+S(D),XS(b)
        • B(a);OGATE,XR(C)::B(B),XB(a)
        • P(j);::R1(C),XP(j)
      • Refutation
        • P(i);
    • Try
      • Q(A);
      • Threat
        • R(G)
      • Vars
        • R(e);N_GUARD,XS(D)::QAR(A)+P(F),XP(h)
        • R(e);OGATEB,P_SPINR(e),XP(F)::B(B),XP(d)
        • S(b);SBLOCK,XS(D)::R1(C)
        • S(k);N_GUARD::QAB(A),XS(k)
      • Refutation
        • P(h);
  • Actual
    • Q(A);
    • Threat
      • QAR2(A)
    • Vars
      • R(e);SBLOCK,XS(D)::R1(C)
      • R(e);SBLOCK,XP(F)::R(G)
      • S(k);N_GUARD::QAB(A),XS(k)
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