MESON Chess Problem Database

Problem Display
PID: 138476 (1N1BBn2/3n4/NPQ5/k1P2K2/p1pP3b/Pr3p2/1R6/1r6 w - - 0 1)

Chepizhni, Viktor Ivanovich

2nd Prize, Alma-Ata, 1960

1N1BBn2/3n4/NPQ5/k1P2K2/p1pP3b/Pr3p2/1R6/1r6

#2

11 + 9

6167 Viktor Chepizhny 2007

SOLUTION

  • SOUND
  • Sets
    • 1...Rxa3
      • 2.Qb5#
    • 1...Rc3
      • 2.Qb5#
    • 1...Rd3
      • 2.Qb5#
    • 1...Re3
      • 2.Qb5#
    • 1...Rb4
      • 2.axb4#
    • 1...Rb5
      • 2.Qxb5#
    • 1...Rxb6
      • 2.Qb5#
    • 1...Se5
      • 2.Qxa4#
    • 1...Sxb6
      • 2.Qxa4#
    • 1...Sf6
      • 2.Qxa4#
    • 1...Sxb8
      • 2.Qxa4#
  • Tries
    • 1.Bxd7?
      • threat
        • 2.Qxa4#
      • 1...Rxa3
        • 2.Qb5#
      • 1...Rb4
        • 2.axb4#
      • 1...Rb5
        • 2.Qxb5#
      • 1...Sxd7!
    • 1.Qxd7?
      • threat
        • 2.Qxa4#
      • 1...Rxa3
        • 2.Qb5#
      • 1...Rb4
        • 2.axb4#
      • 1...Rb5
        • 2.Qxb5#
      • 1...Sxd7!
    • 1.b7+?
      • 1...Rb6
        • 2.Qb5#
      • 1...Sb6
        • 2.Qxa4#
      • 1...Bxd8!
  • Keys
    • 1.Qa8!
      • threat
        • 2.Sc7#
      • 1...Kb5
        • 2.Sc7#
      • 1...Rxb6
        • 2.Sc6#
      • 1...Sxc5
        • 2.Sxc5#
      • 1...Sxb6
        • 2.Sb4#
      • 1...Sxb8
        • 2.Sxb8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 2
    • REMOVED MATES = 8
  • Sets
    • R(b);N_GUARD,XP(B)::QAR1(H)
    • R(b);N_GUARD::QAR1(H)
    • R(b);OGATE::P(B),XR(b)
    • R(b);N_GUARD,P_PINP(D)::QAR1(H),XR(b)
    • R(b);N_GUARD,P_SPINR(b),XP(G)::QAR1(H)
    • S(h);::QAR1(H),XP(d)
    • S(h);P_SPINS(h),XP(G)::QAR1(H),XP(d)
    • S(h);XS(I)::QAR1(H),XP(d)
  • Tries
    • Try
      • B(K);XS(h)
      • Threat
        • QAR1(H),XP(d)
      • Vars
        • R(b);N_GUARD,XP(B)::QAR1(H)
        • R(b);OGATE::P(B),XR(b)
        • R(b);N_GUARD,P_PINP(D)::QAR1(H),XR(b)
      • Refutation
        • S(i);XB(K)
    • Try
      • Q(H);XS(h)
      • Threat
        • QAR1(H),XP(d)
      • Vars
        • R(b);N_GUARD,XP(B)::QAR1(H)
        • R(b);OGATE::P(B),XR(b)
        • R(b);N_GUARD,P_PINP(D)::QAR1(H),XR(b)
      • Refutation
        • S(i);XQ(H)
    • Try
      • P(G);CHECK
      • Vars
        • R(b);P_SPINR(b)::QAR1(H)
        • S(h);P_SPINS(h)::QAR1(H),XP(d)
      • Refutation
        • B(f);XB(J)
  • Actual
    • Q(H);
    • Threat
      • QAR(H)+S(F)
    • Vars
      • K(g);P-FLIGHT,P_SPINR(b),P_SPINS(h)::S(F)
      • R(b);P_SPINR(b),XP(G)::S(I)
      • S(h);XP(D)::QAR(H)+S(F),XS(h)
      • S(h);P_SPINS(h),XP(G)::QAR(H)+S(F)
      • S(h);XS(I)::QAR(H)+S(F),XS(h)
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