MESON Chess Problem Database

Problem Display
PID: 142052 (b7/5n2/1K6/2pk1P2/4R3/3P1Q2/8/3R4 w - - 0 1)

Melvin, Herbert A ('Hamel' or Zaak, HA)

Reynold's News, 1942

(First published on Sun May 3 1942)

b7/5n2/1K6/2pk1P2/4R3/3P1Q2/8/3R4

#2

6 + 4

14867 BCPS Library 2011

SOLUTION

  • SOUND
  • Sets
    • 1...c4
      • 2.dxc4#
  • Tries
    • 1.Qf2?
      • threat
        • 2.Qxc5#
      • 1...c4
        • 2.Qd4#
        • 2.Qc5#
      • 1...Kd6!
    • 1.Qe3?
      • threat
        • 2.Qxc5#
      • 1...c4
        • 2.Rd4#
        • 2.Qd4#
        • 2.Qc5#
        • 2.dxc4#
      • 1...Kd6!
  • Keys
    • 1.d4!
      • threat
        • 2.dxc5#
      • 1...Kc4
        • 2.d5#
      • 1...Kd6
        • 2.dxc5#
      • 1...cxd4
        • 2.Rdxd4#
      • 1...Se5
        • 2.dxe5#
      • 1...c4
        • 2.Re6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • P(a);OGATE::R(A)+P(B)DCHECK,XP(a)
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAR1(C),XP(a)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAR1(C),XP(a)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • P(B);
    • Threat
      • R(A)+P(B),XP(a)
    • Vars
      • K(b);OGATE,S_FLIGHT::R(D)+P(B)
      • K(b);P-FLIGHT::R(A)+P(B)DCHECK,XP(a)
      • P(a);OGATE,P_SPINP(a),XP(B)::R1(A),XP(a)
      • S(c);OGATE::R(A)+P(B),XS(c)
      • P(a);SBLOCK::QAB(C)+R(D)
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