MESON Chess Problem Database

Problem Display
PID: 52684 (2N2Q2/1n1K1p2/3pR3/p1kP3r/p2NRr1b/2p5/B7/6B1 w - - 0 1)

Yarmonov, Igor Petrovich

Zayizhdzhai, Oleksandr Ivanovich

1st Prize, Shakhmatny Vestnik, 1992-1993

2N2Q2/1n1K1p2/3pR3/p1kP3r/p2NRr1b/2p5/B7/6B1

#2

9 + 10

56 The Problemist 2004

SOLUTION

  • SOUND
  • Sets
    • 1...Sd8
      • 2.Qxd6#
  • Tries
    • 1.Sb3+?
      • 1...Kxd5
        • 2.Sa1#
        • 2.Sc1#
        • 2.Sd2#
        • 2.Sxa5#
        • 2.Sc5#
        • 2.Sb6#
      • 1...Kb5!
    • 1.Rxd6?
      • threat
        • 2.Rc6#
      • 1...Kb4
        • 2.Rb6#
      • 1...Rxd5
        • 2.Rxd5#
      • 1...Sxd6
        • 2.Qxd6#
      • 1...Be7!
  • Keys
    • 1.Sxd6!
      • threat
        • 2.Sxb7#
      • 1...Kb4
        • 2.Sc2#
      • 1...Kb6
        • 2.Sc8#
      • 1...Rxd5
        • 2.Sb3#
      • 1...Sxd6
        • 2.Qxd6#
      • 1...fxe6
        • 2.Sxe6#
      • 1...Be7
        • 2.Sf3#
      • 1...Sd8
        • 2.Sb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • S(i);N_GUARD::QAB1(I),XP(h)
  • Tries
    • Try
      • S(C);CHECK
      • Refutation
        • K(f);N_SPINP(h),P-FLIGHT
    • Try
      • R(F);XP(h)
      • Threat
        • QAB(I)+R(F),DCHECK
      • Vars
        • K(f);S_FLIGHT::QAB(I)+R(F),DCHECK
        • R(g);OGATE,P_PINR(F),XP(E)::QAB(I)+R(F),DCHECK,XR(g)
        • S(i);OGATE,P_SPINS(i),XR(F)::QAB1(I),XS(i)
      • Refutation
        • B(d);
  • Actual
    • S(H);XP(h)
    • Threat
      • QAB(I)+S(H),DCHECK,XS(i)
    • Vars
      • K(f);S_FLIGHT::R(D)+S(C),DCHECK
      • K(f);S_FLIGHT::R(F)+S(H),DCHECK
      • R(g);P_PINS(H),SBLOCK,XP(E)::B(A)+S(C),DCHECK
      • S(i);OGATE,P_SPINS(i),XS(H)::QAB1(I),XS(i)
      • P(j);XR(F)::B(A)+S(C),DCHECK,XP(j)
      • B(d);N_GUARD::B(A)+S(C)
      • S(i);::QAB(I)+S(H),DCHECK
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