MESON Chess Problem Database

Problem Display
PID: 185357 (3N1Q2/q1p5/N7/k1p4R/8/1Pp5/K7/5BB1 w - - 0 1)

Lepage, Roger

2nd HM., diagrammes 01. Beginners' Ty., 1974

3N1Q2/q1p5/N7/k1p4R/8/1Pp5/K7/5BB1

#2

8 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Kb6
      • 2.Qxc5#
    • 1...Qa8
      • 2.Qxc5#
  • Tries
    • 1.Rxc5+?
      • 1...Qxc5
        • 2.Qxc5#
      • 1...Kb6!
    • 1.b4+?
      • 1...Kb6
        • 2.Bxc5#
        • 2.Qxc5#
      • 1...Ka4!
  • Keys
    • 1.Sxc5!
      • threat
        • 2.Scb7#
      • 1...Kb4+
        • 2.Sa6#
      • 1...Kb6+
        • 2.Sa4#
      • 1...Qxc5
        • 2.Qxc5#
      • 1...Qb7
        • 2.Scxb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • K(b);P_PINS(F),S_FLIGHT::QAB1(H),XP(c)
    • Q(d);N_GUARD::QAR2(H),XP(c)
  • Tries
    • Try
      • R(E);CHECK,XP(c)
      • Vars
        • Q(d);OGATE,XR(E)::QAR2(H),XQ(d)
      • Refutation
        • K(b);P_PINS(F),S_FLIGHT
    • Try
      • P(D);CHECK
      • Refutation
        • K(b);N_SPINP(c),P-FLIGHT
  • Actual
    • S(F);XP(c)
    • Threat
      • R(E)+S(F),DCHECK
    • Vars
      • K(b);CHECK,S_FLIGHT::QAB(H)+S(F),DCHECK
      • K(b);CHECK,S_FLIGHT::B(B)+S(F),DCHECK
      • Q(d);OGATE,P_SPINQ(d),XS(F)::QAR2(H),XQ(d)
      • Q(d);::R(E)+S(F),DCHECK,XQ(d)
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