MESON Chess Problem Database

Problem Display
PID: 12451 (8/5B2/3B1p1r/3R3p/4kp2/4b2R/bQN5/2n4K w - - 0 1)

Lukyanov, Valentin Volodimirovich

Problem (Zagreb), 1979

8/5B2/3B1p1r/3R3p/4kp2/4b2R/bQN5/2n4K

#2

7 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Bd2
      • 2.Qd4#
    • 1...Bd4
      • 2.Qxd4#
    • 1...f5
      • 2.Qe5#
  • Tries
    • 1.Sxe3?
      • threat
        • 2.Rd4#
        • 2.Qd4#
      • 1...fxe3
        • 2.Qd4#
        • 2.Qg2#
      • 1...f3
        • 2.Qd4#
      • 1...Se2
        • 2.Qc2#
      • 1...Sb3
        • 2.Qc2#
      • 1...Bxd5!
    • 1.Re5+?
      • 1...Kd3
        • 2.Se1#
        • 2.Sb4#
      • 1...fxe5!
    • 1.Qb4+?
      • 1...Bd4
        • 2.Qxd4#
      • 1...Bc4!
    • 1.Qb5?
      • threat
        • 2.Qe8#
      • 1...Bxd5
        • 2.Qxd5#
      • 1...Bd4
        • 2.Rxd4#
      • 1...Sd3
        • 2.Qxd3#
      • 1...f5
        • 2.Re5#
      • 1...Rh8!
  • Keys
    • 1.Qb7!
      • threat
        • 2.Qe7#
      • 1...Bxd5
        • 2.Qxd5#
      • 1...Bd4
        • 2.Re5#
      • 1...Sd3
        • 2.Re5#
      • 1...f5
        • 2.Rd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • B(c);N_GUARD::QAR1(B)
    • B(c);N_GUARD::QAR1(B),XB(c)
    • P(g);N_GUARD::QAR1(B)
  • Tries
    • Try
      • S(C);XB(c)
      • Threat
        • DUALS(2)
      • Vars
        • P(e);::QAR1(B)
        • S(a);N_GUARD::QAB(B)
      • Refutation
        • B(b);XR(E)
    • Try
      • R(E);CHECK
      • Refutation
        • P(g);XR(E)
    • Try
      • Q(B);CHECK
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::QAR1(B),XB(c)
      • Refutation
        • B(b);P_SPINB(b)
    • Try
      • Q(B);
      • Threat
        • QAR(B)
      • Vars
        • B(b);OGATE,XR(E)::QAB1(B),XB(b)
        • B(c);N_GUARD::R1(E),XB(c)
        • S(a);N_GUARD::QAB1(B),XS(a)
        • P(g);N_GUARD::R1(E)
      • Refutation
        • R(h);
  • Actual
    • Q(B);
    • Threat
      • QAR(B)
    • Vars
      • B(b);OGATE,P_SPINB(b),XR(E)::QAB1(B),XB(b)
      • B(c);::QAB(B)+R(E),DCHECK
      • S(a);SBLOCK::QAB(B)+R(E),DCHECK
      • P(g);SBLOCK::QAB(B)+R(E),DCHECK
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