MESON Chess Problem Database

Problem Display
PID: 271210 (B7/B3N3/2q2p2/2pNP3/RP2k1nr/1PQ5/2K3b1/8 w - - 0 1)

Evans, TC

1st Prize, Sunday Referee, 1932

(First published on Sun Oct 16 1932)

B7/B3N3/2q2p2/2pNP3/RP2k1nr/1PQ5/2K3b1/8

#2

10 + 7

15239 Valois Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd5
      • 2.bxc5#
    • 1...Qxa8
      • 2.bxc5#
    • 1...Qd6
      • 2.bxc5#
    • 1...Qe6
      • 2.bxc5#
    • 1...Qc7
      • 2.bxc5#
    • 1...Qc8
      • 2.bxc5#
    • 1...Sf2
      • 2.Qe3#
    • 1...Sh2
      • 2.Qe3#
    • 1...Se3+
      • 2.Qxe3#
    • 1...Sxe5
      • 2.Qe3#
    • 1...Sh6
      • 2.Qe3#
    • 1...fxe5
      • 2.Qd3#
  • Tries
    • 1.Sxf6+?
      • 1...Sxf6
        • 2.bxc5#
      • 1...Kf4!
    • 1.Qe1+?
      • 1...Kd4
        • 2.b5#
      • 1...Se3+
        • 2.Qxe3#
      • 1...Kf3!
  • Keys
    • 1.Qg3!
      • threat
        • 2.Qf4#
      • 1...Se3+
        • 2.Qxe3#
      • 1...cxb4+
        • 2.Sc3#
      • 1...Kd4
        • 2.b5#
      • 1...Qxd5
        • 2.bxc5#
      • 1...Sxe5
        • 2.Qe3#
      • 1...fxe5
        • 2.Qd3#
      • 1...Sf2
        • 2.Qe3#
      • 1...Sh2
        • 2.Qe3#
      • 1...Sh6
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • Q(f);N_GUARD,P_SPINQ(f),XS(F)::R(D)+P(E),XP(e)
    • Q(f);N_GUARD,XB(J)::R(D)+P(E),XP(e)
    • Q(f);N_GUARD::R(D)+P(E),XP(e)
    • S(c);N_GUARD::QAR1(C)
    • S(c);CHECK,N_GUARD::QAR1(C),XS(c)
    • S(c);N_GUARD,SBLOCK,XP(G)::QAR1(C)
    • P(g);SBLOCK,XP(G)::QAB1(C)
  • Tries
    • Try
      • S(F);CHECK,P_PINQ(f),XP(g)
      • Vars
        • S(c);XS(F)::R(D)+P(E),XP(e)
      • Refutation
        • K(b);N_SPINQ(f),P-FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);N_GUARD,P-FLIGHT,P_SPINP(e)::R(D)+P(E)
        • S(c);CHECK,N_GUARD,P_SPINS(c)::QAR1(C),XS(c)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(C);
    • Threat
      • QAR1(C)
    • Vars
      • S(c);CHECK,N_GUARD::QAR1(C),XS(c)
      • P(e);CHECK,P_SPINP(e),XP(E)::S(F)
      • K(b);P-FLIGHT,P_SPINP(e)::R(D)+P(E)
      • Q(f);N_GUARD,P_SPINQ(f),XS(F)::R(D)+P(E),XP(e)
      • S(c);N_GUARD,SBLOCK,XP(G)::QAR1(C)
      • P(g);SBLOCK,XP(G)::QAB1(C)
      • S(c);N_GUARD::QAR1(C)
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