MESON Chess Problem Database

Problem Display
PID: 247886 (R2Q4/1rqn4/4p1n1/1pk1N2R/PNPpP3/B2P4/8/2K5 w - - 0 1)

Mirri, Giorgio

4th HM., Blikeng-80 JT, 1993-1994

R2Q4/1rqn4/4p1n1/1pk1N2R/PNPpP3/B2P4/8/2K5

#2

11 + 8

14867 BCPS Library 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kb6
      • 2.Sxd7#
    • 1...Kd6
      • 2.Sf7#
    • 1...Qa5
      • 2.Sa6#
    • 1...Qb6
      • 2.Sa6#
    • 1...Qd6
      • 2.Sa6#
      • 2.Sxd7#
    • 1...Qb8
      • 2.Sa6#
    • 1...Qc6
      • 2.Sa6#
    • 1...Qc8
      • 2.Sa6#
    • 1...Rb6
      • 2.Sa6#
    • 1...Rb8
      • 2.Qxc7#
    • 1...Sb6
      • 2.Sa6#
  • Tries
    • 1.Sa2+?
      • 1...Kb6
        • 2.a5#
      • 1...b4!
    • 1.Sc2+?
      • 1...Kb6
        • 2.a5#
      • 1...b4!
    • 1.Sbc6+?
      • 1...Kb6
        • 2.a5#
      • 1...b4!
    • 1.Qe7+?
      • 1...Kb6
        • 2.Ra6#
        • 2.a5#
      • 1...Qd6
        • 2.Sxd7#
      • 1...Sxe7!
    • 1.axb5?
      • threat
        • 2.Sd5#
      • 1...Kb6
        • 2.Sxd7#
      • 1...Kd6
        • 2.Sbc6#
        • 2.Sf7#
      • 1...Rxb5
        • 2.Qxc7#
      • 1...Qa5
        • 2.Sa6#
      • 1...Ra7!
  • Keys
    • 1.cxb5!
      • threat
        • 2.Sd5#
      • 1...Kb6+
        • 2.Sc4#
      • 1...Kd6+
        • 2.Sbc6#
      • 1...Rxb5
        • 2.Qxc7#
      • 1...Qa5
        • 2.Sa6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 7
  • Sets
    • K(c);P_PINP(F),P_SPINQ(g),S_FLIGHT::S(H),XS(h)
    • K(c);P_PINP(F),P_SPINS(h),S_FLIGHT::S(H)
    • Q(g);::B(B)+S(E),DCHECK
    • R(f);SBLOCK::B(B)+S(E),DCHECK
    • R(f);N_GUARD::QAR2(K),XQ(g)
    • S(h);SBLOCK::B(B)+S(E),DCHECK
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(c);P_PINP(F),P_SPINQ(g),S_FLIGHT::P(D)
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • S(E);CHECK
      • Vars
        • K(c);P_SPINQ(g),S_FLIGHT::P(D)
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • S(E);CHECK
      • Vars
        • K(c);P_SPINQ(g),S_FLIGHT::P(D)
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • Q(K);CHECK
      • Vars
        • Q(g);P_SPINQ(g)::R(I)+S(H),DCHECK,XS(h)
      • Refutation
        • S(e);XQ(K)
    • Try
      • P(D);XP(b)
      • Threat
        • B(B)+S(E)
      • Vars
        • K(c);P_PINP(F),P_SPINQ(g),S_FLIGHT::S(H),XS(h)
        • R(f);N_GUARD,XP(D)::QAR2(K),XQ(g)
        • Q(g);::B(B)+S(E),DCHECK
      • Refutation
        • R(f);
  • Actual
    • P(F);XP(b)
    • Threat
      • B(B)+S(E)
    • Vars
      • K(c);CHECK,P_SPINQ(g),S_FLIGHT::S(H)
      • K(c);CHECK,P_SPINS(h),S_FLIGHT::B(B)+S(E)
      • R(f);N_GUARD,XP(F)::QAR2(K),XQ(g)
      • Q(g);::B(B)+S(E),DCHECK
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