MESON Chess Problem Database

Problem Display
PID: 87622 (4N3/3Q4/1p6/2k5/6r1/1KP5/8/8 w - - 0 1)

Lokker, Miklosh S

Buletin Problemistic, 1973

4N3/3Q4/1p6/2k5/6r1/1KP5/8/8

#2

4 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rb4+
      • 2.cxb4#
    • 1...Rd4
      • 2.cxd4#
    • 1...b5
      • 2.Qd6#
  • Tries
    • 1.Sc7?
      • threat
        • 2.Sa6#
        • 2.Se6#
        • 2.Qd5#
      • 1...Rb4+
        • 2.cxb4#
      • 1...Ra4
        • 2.Se6#
        • 2.Qd5#
      • 1...Rd4
        • 2.Sa6#
        • 2.Se6#
        • 2.cxd4#
      • 1...Re4
        • 2.Sa6#
        • 2.Qd5#
      • 1...Rg5
        • 2.Sa6#
        • 2.Se6#
      • 1...Rg6
        • 2.Sa6#
        • 2.Qd5#
      • 1...b5!
  • Keys
    • 1.Sf6!
      • threat
        • 2.Qd5#
      • 1...Rb4+
        • 2.cxb4#
      • 1...b5
        • 2.Qc7#
      • 1...Rd4
        • 2.cxd4#
      • 1...Rg5
        • 2.Se4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • R(a);CHECK,OGATE::P(B),XR(a)
    • R(a);OGATE::P(B),XR(a)
    • P(c);SBLOCK::QAB1(C)
  • Tries
    • Try
      • S(D);
      • Threat
        • DUALS(3)
      • Vars
        • R(a);CHECK,OGATE::P(B),XR(a)
      • Refutation
        • P(c);
  • Actual
    • S(D);
    • Threat
      • QAR1(C)
    • Vars
      • R(a);CHECK,OGATE::P(B),XR(a)
      • P(c);SBLOCK::QAR2(C)
      • R(a);OGATE::P(B),XR(a)
      • R(a);N_GUARD::S(D)
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