MESON Chess Problem Database

Problem Display
PID: 151006 (8/3p1n1p/4pK2/1P1k1Nn1/1bp1N3/2P1PP2/6BQ/8 w - - 0 1)

Coppard, LG

The Referee, 1927

(First published on Sun Jan 30 1927)

8/3p1n1p/4pK2/1P1k1Nn1/1bp1N3/2P1PP2/6BQ/8

#2

9 + 8

15239 Valois Notebooks 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Ba5
      • 2.Se7#
    • 1...Be7+
      • 2.Sxe7#
    • 1...Se5
      • 2.Qxe5#
    • 1...Sd6
      • 2.Se7#
      • 2.Qe5#
    • 1...Sh6
      • 2.Qe5#
    • 1...Sd8
      • 2.Qe5#
    • 1...Sh8
      • 2.Qe5#
    • 1...d6
      • 2.Se7#
  • Tries
    • 1.Qd6+?
      • 1...Sxd6
        • 2.Se7#
      • 1...Bxd6!
    • 1.cxb4?
      • threat
        • 2.Sc3#
        • 2.Se7#
      • 1...Sxe4+
        • 2.fxe4#
      • 1...Sxf3
        • 2.Sc3#
      • 1...exf5
        • 2.Sc3#
      • 1...c3!
  • Keys
    • 1.Qc7!
      • threat
        • 2.Qb7#
      • 1...Bxc3+
        • 2.Sxc3#
      • 1...Be7+
        • 2.Sxe7#
      • 1...Sxe4+
        • 2.fxe4#
      • 1...Se5
        • 2.Qxe5#
      • 1...Sd6
        • 2.Se7#
      • 1...Sd8
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 4
  • Sets
    • B(a);N_GUARD::S(H)
    • B(a);CHECK,N_GUARD::S(H),XB(a)
    • S(g);N_GUARD::QAR1(B),XS(g)
    • S(g);N_GUARD::QAR1(B)
    • P(f);S_CUTB(a)::S(H)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • S(g);XQ(B)::S(H)
      • Refutation
        • B(a);XQ(B)
    • Try
      • P(C);XB(a)
      • Threat
        • DUALS(2)
      • Vars
        • S(d);CHECK,OGATE,XS(F)::P(E),XS(d)
        • S(d);XP(E)::S(F)
        • P(e);XS(H)::S(F)
      • Refutation
        • P(b);
  • Actual
    • Q(B);
    • Threat
      • QAB(B)
    • Vars
      • B(a);CHECK,XP(C)::S(F),XB(a)
      • B(a);CHECK,N_GUARD::S(H),XB(a)
      • S(d);CHECK,OGATE,XS(F)::P(E),XS(d)
      • S(g);N_GUARD::QAR1(B),XS(g)
      • S(g);S_CUTB(a)::S(H)
      • S(g);N_GUARD::QAR1(B)
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