MESON Chess Problem Database

Problem Display
PID: 169034 (n5Qr/PkN2Rp1/ppn5/p2N4/8/K2p4/1R3p2/6BB w - - 0 1)

Novitski, Petr Adrinovich

2nd Prize, SuperProblem 087. TT, 2013

n5Qr/PkN2Rp1/ppn5/p2N4/8/K2p4/1R3p2/6BB

#2

9 + 10

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kxa7
      • 2.Sb5#
    • 1...Rxh1
      • 2.Qxa8#
    • 1...Rh2
      • 2.Qxa8#
    • 1...Rh3
      • 2.Qxa8#
    • 1...Rh4
      • 2.Qxa8#
    • 1...Rh5
      • 2.Qxa8#
    • 1...Rh6
      • 2.Qxa8#
    • 1...Rh7
      • 2.Qxa8#
    • 1...Sxc7
      • 2.Rxc7#
      • 2.a8Q#
  • Tries
    • 1.Sf4?
      • threat
        • 2.Sxa8#
      • 1...Kxa7
        • 2.Sb5#
      • 1...Rxh1
        • 2.Qxa8#
      • 1...Sxc7
        • 2.a8Q#
      • 1...Rxg8!
    • 1.Sf6?
      • threat
        • 2.Sxa8#
      • 1...Kxa7
        • 2.Sb5#
      • 1...Rxh1
        • 2.Qxa8#
      • 1...Sxc7
        • 2.a8Q#
      • 1...Rxg8!
    • 1.Sb5+?
      • 1...Sc7
        • 2.Rxc7#
        • 2.a8Q#
        • 2.a8B#
      • 1...Se7!
    • 1.Se6+?
      • 1...Sc7
        • 2.Rxc7#
        • 2.a8Q#
      • 1...Se7!
    • 1.Rxb6+?
      • 1...Kxa7
        • 2.Sb5#
      • 1...Sxb6!
  • Keys
    • 1.Sxb6!
      • threat
        • 2.Scxa8#
      • 1...Kxa7
        • 2.Sc8#
      • 1...Rxh1
        • 2.Qxa8#
      • 1...Sxb6
        • 2.Se6#
        • 2.Sa8#
        • 2.a8Q#
      • 1...Sxc7
        • 2.a8Q#
      • 1...f1Q
        • 2.Sbxa8#
      • 1...f1R
        • 2.Sbxa8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • K(g);N_SPINP(e),P-FLIGHT,XP(F)::R(H)+S(G),DCHECK
    • R(j);N_GUARD,XB(B)::QAB1(I),XS(i)
    • R(j);N_GUARD::QAB1(I),XS(i)
  • Tries
    • Try
      • S(E);P_PINS(f)
      • Threat
        • R(H)+S(G),XS(i)
      • Vars
        • K(g);N_SPINP(e),N_SPINS(f),P-FLIGHT,XP(F)::R(H)+S(G),DCHECK
        • R(j);N_GUARD,N_SPINS(f),XB(B)::QAB1(I),XS(i)
        • S(i);OGATE,XS(G)::P=Q
      • Refutation
        • R(j);XQ(I)
    • Try
      • S(E);P_PINS(f)
      • Threat
        • R(H)+S(G),XS(i)
      • Vars
        • K(g);N_SPINP(e),N_SPINS(f),P-FLIGHT,XP(F)::R(H)+S(G),DCHECK
        • R(j);N_GUARD,N_SPINS(f),XB(B)::QAB1(I),XS(i)
        • S(i);OGATE,XS(G)::P=Q
      • Refutation
        • R(j);XQ(I)
    • Try
      • S(G);CHECK,N_PINP(e)
      • Refutation
        • S(f);P_SPINS(f)
    • Try
      • S(G);CHECK
      • Refutation
        • S(f);P_SPINS(f)
    • Try
      • R(C);CHECK,XP(e)
      • Vars
        • K(g);P-FLIGHT,XP(F)::R(H)+S(G),DCHECK
      • Refutation
        • S(i);XR(C)
  • Actual
    • S(E);P_PINS(f),XP(e)
    • Threat
      • R(H)+S(G),XS(i)
    • Vars
      • K(g);N_SPINS(f),P-FLIGHT,XP(F)::S(E)
      • R(j);N_GUARD,N_SPINS(f),XB(B)::QAB1(I),XS(i)
      • S(i);OGATE,XS(G)::P=Q
      • P(a);::R(C)+S(E),XS(i)
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