MESON Chess Problem Database

Problem Display
PID: 138725 (4Q3/8/6Np/8/3K2k1/8/5B2/7R w - - 0 1)

Lincoln, Robert A

StrateGems, 2010

4Q3/8/6Np/8/3K2k1/8/5B2/7R

#2

5 + 2

SOLUTION

  • SOUND
  • Tries
    • 1.Rg1+?
      • 1...Kf3
        • 2.Qe3#
      • 1...Kf5
        • 2.Qf7#
        • 2.Qe5#
      • 1...Kh5
        • 2.Sf4#
        • 2.Sh4#
        • 2.Se5#
        • 2.Se7#
        • 2.Sf8#
        • 2.Sh8#
        • 2.Qb5#
        • 2.Qe2#
        • 2.Qe5#
      • 1...Kh3!
    • 1.Qb5?
      • threat
        • 2.Qh5#
      • 1...h5
        • 2.Qxh5#
      • 1...Kf3!
    • 1.Qe5?
      • threat
        • 2.Qf4#
        • 2.Qh5#
      • 1...h5
        • 2.Qf4#
        • 2.Qxh5#
      • 1...Kf3!
    • 1.Qe6+?
      • 1...Kg5
        • 2.Be3#
      • 1...Kf3!
  • Keys
    • 1.Bh4!
      • 1...Kf3
        • 2.Qe4#
      • 1...Kf5
        • 2.Qe4#
      • 1...Kh5
        • 2.Se5#
      • 1...h5
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • K(a);S_FLIGHT::QAR1(E)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);
      • Threat
        • QAB1(E)
      • Vars
        • P(b);::QAB1(E),XP(b)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);
      • Threat
        • DUALS(2)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(a);P-FLIGHT::B(B)
      • Refutation
        • K(a);S_FLIGHT
  • Actual
    • B(B);
    • Vars
      • K(a);S_FLIGHT::QAB1(E)
      • K(a);S_FLIGHT::QAB(E)+S(D)
      • P(b);SBLOCK::QAR2(E)
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