MESON Chess Problem Database

Problem Display
PID: 6135 (bQ5n/8/N5p1/3k3r/R2N2P1/q4PKp/8/3R3B w - - 0 1)

Ellerman, Arnoldo

L'Echiquier, 1927

bQ5n/8/N5p1/3k3r/R2N2P1/q4PKp/8/3R3B

#2

9 + 7

5137 1001 Problemas 1945

SOLUTION

  • SOUND
  • Sets
    • 1...Qc1
      • 2.f4#
    • 1...Qc5
      • 2.f4#
    • 1...Qd6+
      • 2.f4#
    • 1...Qf8
      • 2.f4#
    • 1...Qa1
      • 2.f4#
    • 1...Qxf3+
      • 2.Bxf3#
  • Tries
    • 1.Sb5+?
      • 1...Kc6
        • 2.Sa7#
      • 1...Qd3
        • 2.Qd6#
      • 1...Ke6!
    • 1.Qd6+?
      • 1...Qxd6+
        • 2.f4#
      • 1...Kxd6!
    • 1.Qb3+?
      • 1...Ke5
        • 2.Qe6#
      • 1...Kd6
        • 2.Qe6#
      • 1...Qxb3!
    • 1.Qb5+?
      • 1...Qc5
        • 2.Qxc5#
      • 1...Kd6!
    • 1.Qd8+?
      • 1...Qd6+
        • 2.f4#
      • 1...Ke5!
    • 1.Qg8+?
      • 1...Ke5
        • 2.Qe6#
      • 1...Kd6
        • 2.Qe6#
      • 1...Sf7!
  • Keys
    • 1.Qc8!
      • threat
        • 2.Qe6#
      • 1...Qd6+
        • 2.f4#
      • 1...Qxf3+
        • 2.Sxf3#
      • 1...Ke5
        • 2.Qe6#
      • 1...Kd6
        • 2.Qe6#
      • 1...Qe7
        • 2.Sc6#
      • 1...Qe3
        • 2.Qc5#
      • 1...Re5
        • 2.Sb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 4
  • Sets
    • Q(a);N_PINP(C)::B(B)+P(C)
    • Q(a);CHECK,N_PINP(C)::B(B)+P(C)
    • Q(a);CHECK,OGATE,P_SPINQ(a),XP(C)::B(B),XQ(a)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(c);S_FLIGHT::S(F)
        • Q(a);P_SPINQ(a)::QAR1(I)
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(I);CHECK
      • Vars
        • Q(a);CHECK,N_PINP(C),SBLOCK,XQ(I)::B(B)+P(C)
      • Refutation
        • K(c);P-FLIGHT,XQ(I)
    • Try
      • Q(I);CHECK,N_SPINP(C)
      • Vars
        • K(c);OGATE,P-FLIGHT::QAR1(I)
      • Refutation
        • Q(a);P_PINP(C),XQ(I)
    • Try
      • Q(I);CHECK
      • Vars
        • Q(a);N_GUARD,N_PINP(C),P_SPINQ(a)::QAR1(I),XQ(a)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(I);CHECK
      • Vars
        • Q(a);CHECK,N_PINP(C),P_SPINQ(a)::B(B)+P(C)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(I);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(I)
      • Refutation
        • S(g);P_SPINS(g)
  • Actual
    • Q(I);
    • Threat
      • QAB1(I)
    • Vars
      • Q(a);CHECK,N_PINP(C),SBLOCK::B(B)+P(C)
      • Q(a);CHECK,P_SPINQ(a),XP(C)::R(A)+S(F),XQ(a)
      • K(c);P-FLIGHT::QAR1(I)
      • Q(a);N_GUARD,N_PINP(C)::R(A)+S(F)
      • Q(a);N_GUARD::QAR1(I)
      • R(d);SBLOCK::R(A)+S(F)
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