MESON Chess Problem Database

Problem Display
PID: 234708 (8/5p2/5Qp1/7k/4p2N/7K/8/8 w - - 0 1)

Lincoln, Robert A

Kudesnik, 2012

8/5p2/5Qp1/7k/4p2N/7K/8/8

#2

3 + 4

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...g5
      • 2.Qh8#
  • Tries
    • 1.Sf5?
      • threat
        • 2.Qh4#
      • 1...g5
        • 2.Sg3#
        • 2.Sg7#
        • 2.Qh6#
        • 2.Qxf7#
      • 1...gxf5!
    • 1.Sxg6?
      • threat
        • 2.Sf4#
      • 1...fxg6
        • 2.Qh4#
      • 1...Kh6!
    • 1.Qxf7?
      • threat
        • 2.Qxg6#
      • 1...Kh6
        • 2.Qxg6#
      • 1...Kg5!
  • Keys
    • 1.Sf3!
      • threat
        • 2.Qh4#
        • 2.Qg5#
        • 2.Qh8#
      • 1...Kh6
        • 2.Qh8#
      • 1...exf3
        • 2.Qh4#
      • 1...g5
        • 2.Qxg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • P(c);SBLOCK::QAR(C)
  • Tries
    • Try
      • S(B);
      • Threat
        • QAR1(C)
      • Refutation
        • P(c);XS(B)
    • Try
      • S(B);XP(c)
      • Threat
        • S(B)
      • Vars
        • P(d);SBLOCK,XS(B)::QAR1(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(C);P_PINP(c),XP(d)
      • Threat
        • QAB1(C),XP(c)
      • Vars
        • K(b);N_SPINP(c),P-FLIGHT::QAR1(C),XP(c)
      • Refutation
        • K(b);N_SPINP(c),P-FLIGHT
  • Actual
    • S(B);
    • Threat
      • DUALS(3)
    • Vars
      • K(b);P-FLIGHT,P_SPINP(c)::QAR2(C)
      • P(a);XS(B)::QAR1(C)
      • P(c);::QAR1(C),XP(c)
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