MESON Chess Problem Database

Problem Display
PID: 79793 (B1R5/1n6/1pr5/nP1k1P2/N1N1pK2/1R2P3/5P2/4bQ2 w - - 0 1)

Pituk, Alexander

Il Problema, 1933

B1R5/1n6/1pr5/nP1k1P2/N1N1pK2/1R2P3/5P2/4bQ2

#2

11 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc4
      • 2.Rd8#
    • 1...Rc5
      • 2.Saxb6#
      • 2.Rd8#
    • 1...Sc5
      • 2.Saxb6#
    • 1...Sd6
      • 2.Scxb6#
    • 1...Sd8
      • 2.Rxd8#
  • Tries
    • 1.Rd3+?
      • 1...exd3
        • 2.Qxd3#
      • 1...Kxc4!
    • 1.Rxc6?
      • threat
        • 2.Saxb6#
        • 2.Scxb6#
        • 2.Rd6#
      • 1...Sxc4
        • 2.Qxc4#
      • 1...Bb4
        • 2.Saxb6#
        • 2.Scxb6#
      • 1...Sd6
        • 2.Saxb6#
        • 2.Scxb6#
        • 2.Rc5#
        • 2.Rxd6#
      • 1...Sxc6!
    • 1.Rd8+?
      • 1...Rd6
        • 2.Scxb6#
        • 2.Rxd6#
      • 1...Sd6
        • 2.Scxb6#
        • 2.Rxd6#
      • 1...Sxd8!
    • 1.Qh1?
      • threat
        • 2.Qxe4#
      • 1...Rxc4
        • 2.Rd8#
      • 1...Sxc4
        • 2.Rd3#
      • 1...Re6
        • 2.Rd3#
      • 1...Sc5
        • 2.Saxb6#
      • 1...Sd6
        • 2.Scxb6#
      • 1...Kxc4!
  • Keys
    • 1.Qg2!
      • threat
        • 2.Qxe4#
      • 1...Kxc4
        • 2.Qg8#
      • 1...Rxc4
        • 2.Rd8#
      • 1...Sxc4
        • 2.Rd3#
      • 1...Re6
        • 2.Rd3#
      • 1...Sc5
        • 2.Saxb6#
      • 1...Sd6
        • 2.Scxb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(f);N_GUARD,P_SPINS(g),XS(F)::R(K)
    • S(g);P_SPINR(f),SBLOCK::S(E),XP(e)
    • S(g);P_SPINR(f),SBLOCK::S(F),XP(e)
    • S(g);N_GUARD,P_SPINR(f)::R(K),XS(g)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • P(b);OGATE,XR(C)::QAR2(A),XP(b)
      • Refutation
        • K(d);P_SPINR(f),S_FLIGHT,XS(F)
    • Try
      • R(K);XR(f)
      • Threat
        • DUALS(3)
      • Vars
        • S(c);OGATE,XS(F)::QAB1(A),XS(c)
      • Refutation
        • S(c);XR(K)
    • Try
      • R(K);CHECK
      • Refutation
        • S(g);P_SPINR(f),XR(K)
    • Try
      • Q(A);P_PINP(b)
      • Threat
        • QAB1(A),XP(b)
      • Vars
        • R(f);N_GUARD,P_SPINS(g),SBLOCK,XS(F)::R(K)
        • S(c);SBLOCK,XS(F)::R(C)
        • R(f);P_SPINS(g)::R(C)
        • S(g);P_SPINR(f),SBLOCK::S(E),XP(e)
        • S(g);P_SPINR(f),SBLOCK::S(F),XP(e)
      • Refutation
        • K(d);N_SPINP(b),P_SPINR(f),S_FLIGHT,XS(F)
  • Actual
    • Q(A);P_PINP(b)
    • Threat
      • QAB1(A),XP(b)
    • Vars
      • K(d);N_SPINP(b),P_SPINR(f),S_FLIGHT,XS(F)::QAB(A)
      • R(f);N_GUARD,P_SPINS(g),SBLOCK,XS(F)::R(K)
      • S(c);SBLOCK,XS(F)::R(C)
      • R(f);P_SPINS(g)::R(C)
      • S(g);P_SPINR(f),SBLOCK::S(E),XP(e)
      • S(g);P_SPINR(f),SBLOCK::S(F),XP(e)
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