MESON Chess Problem Database

Problem Display
PID: 150877 (n2BK2b/3P3r/P1kPR1p1/P1N3qR/2P5/2pN4/3p4/8 w - - 0 1)

Hallam, LC

The Referee, 1926

(First published on Sun Oct 31 1926)

n2BK2b/3P3r/P1kPR1p1/P1N3qR/2P5/2pN4/3p4/8

#2

11 + 8

15239 Valois Notebooks 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Qe3
      • 2.Sb4#
    • 1...Qf4
      • 2.Sb4#
    • 1...Qh4
      • 2.Sb4#
    • 1...Qf6
      • 2.Sb4#
    • 1...Qh6
      • 2.Sb4#
    • 1...Qe7+
      • 2.dxe7#
    • 1...Qg1
      • 2.Sb4#
    • 1...Qg2
      • 2.Sb4#
    • 1...Qg3
      • 2.Sb4#
    • 1...Qg4
      • 2.Sb4#
    • 1...Qxc5
      • 2.Rxc5#
    • 1...Re7+
      • 2.dxe7#
    • 1...Sc7+
      • 2.dxc7#
  • Tries
    • 1.Sb3?
      • threat
        • 2.Sb4#
      • 1...Qe7+
        • 2.dxe7#
      • 1...Re7+
        • 2.dxe7#
      • 1...Sc7+
        • 2.dxc7#
      • 1...Qxa5
        • 2.Sxa5#
      • 1...Qb5
        • 2.cxb5#
      • 1...Qc5
        • 2.Rxc5#
      • 1...Qxd8+!
    • 1.Rxg5?
      • threat
        • 2.Sb4#
      • 1...Re7+
        • 2.dxe7#
      • 1...Sc7+
        • 2.dxc7#
      • 1...Be5!
  • Keys
    • 1.Sb7!
      • threat
        • 2.Sb4#
      • 1...Qe7+
        • 2.dxe7#
      • 1...Qxd8+
        • 2.Sxd8#
      • 1...Re7+
        • 2.dxe7#
      • 1...Sc7+
        • 2.dxc7#
      • 1...Qxa5
        • 2.Sxa5#
      • 1...Qb5
        • 2.cxb5#
      • 1...Qc5
        • 2.Rxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 9
  • Sets
    • Q(c);P_PINR(H)::S(A)
    • Q(c);::S(A)
    • Q(c);CHECK,OGATE::R(H)+P(G),XQ(c)
    • Q(c);OGATE,XS(D)::R1(E),XQ(c)
    • R(f);CHECK,OGATE::R(H)+P(G),XR(f)
    • S(g);CHECK,OGATE::R(H)+P(G),XS(g)
  • Tries
    • Try
      • S(D);
      • Threat
        • S(A)
      • Vars
        • Q(c);CHECK,OGATE::R(H)+P(G),XQ(c)
        • R(f);CHECK,OGATE::R(H)+P(G),XR(f)
        • S(g);CHECK,OGATE::R(H)+P(G),XS(g)
        • Q(c);XP(C)::S(D),XQ(c)
        • Q(c);OGATE::P(B),XQ(c)
        • Q(c);OGATE::R1(E),XQ(c)
      • Refutation
        • Q(c);CHECK,XB(J)
    • Try
      • R(E);XQ(c)
      • Threat
        • S(A)
      • Vars
        • R(f);CHECK,OGATE::R(H)+P(G),XR(f)
        • S(g);CHECK,OGATE::R(H)+P(G),XS(g)
      • Refutation
        • B(h);
  • Actual
    • S(D);
    • Threat
      • S(A)
    • Vars
      • Q(c);CHECK,OGATE::R(H)+P(G),XQ(c)
      • Q(c);CHECK,XB(J)::S(D),XQ(c)
      • R(f);CHECK,OGATE::R(H)+P(G),XR(f)
      • S(g);CHECK,OGATE::R(H)+P(G),XS(g)
      • Q(c);XP(C)::S(D),XQ(c)
      • Q(c);OGATE::P(B),XQ(c)
      • Q(c);OGATE::R1(E),XQ(c)
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