MESON Chess Problem Database

Problem Display
PID: 144832 (r3k3/2Q3b1/5pKN/8/8/8/8/8 w q - 0 1)

Lincoln, Robert A

StrateGems, 1998

r3k3/2Q3b1/5pKN/8/8/8/8/8

#2

3 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Kf8
      • 2.Qf7#
    • 1...Rd8
      • 2.Qf7#
  • Tries
    • 1.Sf5?
      • threat
        • 2.Qe7#
      • 1...Kf8
        • 2.Qf7#
      • 1...Ra7
        • 2.Qc8#
      • 1...Bf8!
    • 1.Qd7+?
      • 1...Kf8
        • 2.Qf7#
      • 1...Kxd7!
    • 1.Qc8+?
      • 1...Ke7
        • 2.Sf5#
      • 1...Rxc8!
  • Keys
    • 1.Sg8!
      • threat
        • 2.Qe7#
      • 1...Kf8
        • 2.Qf7#
      • 1...Ra7
        • 2.Qc8#
      • 1...Bf8
        • 2.Sxf6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • K(d);P-FLIGHT::QAR1(C)
    • R(c);SBLOCK::QAB1(C)
  • Tries
    • Try
      • S(B);
      • Threat
        • QAR1(C)
      • Vars
        • K(d);P-FLIGHT::QAR1(C)
        • R(c);N_GUARD::QAR2(C)
      • Refutation
        • B(b);
    • Try
      • Q(C);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR1(C)
      • Refutation
        • K(d);S_FLIGHT,XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(d);P-FLIGHT::S(B)
      • Refutation
        • R(c);XQ(C)
  • Actual
    • S(B);
    • Threat
      • QAR1(C)
    • Vars
      • K(d);P-FLIGHT::QAR1(C)
      • R(c);N_GUARD::QAR2(C)
      • B(b);N_GUARD,SBLOCK::S(B),XP(a)
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