MESON Chess Problem Database

Problem Display
PID: 267633 (8/1p1K4/1B1NP1Np/3k2p1/r6q/3P4/1bnR4/1Q6 w - - 0 1)

Allen, Frederick B

Sunday Referee, 1939

(First published on Sun May 14 1939)

8/1p1K4/1B1NP1Np/3k2p1/r6q/3P4/1bnR4/1Q6

#2

8 + 8

15239 Valois Notebooks 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qc4
      • 2.dxc4#
    • 1...Qe4
      • 2.dxe4#
    • 1...Rc4
      • 2.dxc4#
    • 1...Re4
      • 2.dxe4#
    • 1...Ba1
      • 2.Qb5#
    • 1...Bc1
      • 2.Qb5#
    • 1...Bc3
      • 2.Qb5#
    • 1...Be5
      • 2.Se7#
      • 2.Qb5#
    • 1...Bf6
      • 2.Qb5#
    • 1...Bg7
      • 2.Qb5#
    • 1...Bh8
      • 2.Qb5#
  • Tries
    • 1.Qa2+?
      • 1...Qc4
        • 2.dxc4#
      • 1...Rc4
        • 2.dxc4#
      • 1...Rxa2!
    • 1.Qh1+?
      • 1...Qe4
        • 2.dxe4#
      • 1...Re4
        • 2.dxe4#
      • 1...Qxh1!
  • Keys
    • 1.d4!
      • threat
        • 2.Se7#
      • 1...Qxd4
        • 2.Qh1#
      • 1...Rxd4
        • 2.Qa2#
      • 1...Bxd4
        • 2.Qb5#
      • 1...Sxd4
        • 2.Qf5#
      • 1...g4
        • 2.Sf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 10
  • Sets
    • Q(d);OGATE::R(B)+P(C)DCHECK,XQ(d)
    • R(c);OGATE::R(B)+P(C)DCHECK,XR(c)
    • B(a);OGATE::QAR2(A)
  • Tries
    • Try
      • Q(A);CHECK
      • Vars
        • Q(d);OGATE,P_SPINQ(d)::R(B)+P(C)DCHECK,XQ(d)
        • R(c);OGATE,P_SPINR(c)::R(B)+P(C)DCHECK,XR(c)
      • Refutation
        • R(c);XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • Q(d);OGATE,P_SPINQ(d)::R(B)+P(C)DCHECK,XQ(d)
        • R(c);OGATE,P_SPINR(c)::R(B)+P(C)DCHECK,XR(c)
      • Refutation
        • Q(d);XQ(A)
  • Actual
    • P(C);
    • Threat
      • S(G)
    • Vars
      • Q(d);N_GUARD,P_SPINQ(d),XP(C)::QAB(A)
      • R(c);N_GUARD,P_SPINR(c),XP(C)::QAB(A)
      • B(a);OGATE,P_SPINB(a),XP(C)::QAR2(A)
      • S(b);OGATE,P_SPINS(b),XP(C)::QAR2(A)
      • P(f);N_GUARD,S_CUTQ(d)::S(G)
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