MESON Chess Problem Database

Problem Display
PID: 65257 (4BR2/8/8/8/3K2k1/3n4/7Q/7n w - - 0 1)

Lincoln, Robert A

Comm., Amirov MT, 2004

4BR2/8/8/8/3K2k1/3n4/7Q/7n

#2

4 + 3

145 StrateGems 2006

SOLUTION

  • SOUND
  • Sets
    • 1...Kg5
      • 2.Qh5#
  • Tries
    • 1.Rf4+?
      • 1...Kg5
        • 2.Qh4#
      • 1...Sxf4!
    • 1.Rg8+?
      • 1...Kf3
        • 2.Bh5#
        • 2.Bc6#
      • 1...Kf5!
    • 1.Qg1+?
      • 1...Kh3
        • 2.Rh8#
      • 1...Kh4
        • 2.Rh8#
      • 1...Sg3!
    • 1.Qg2+?
      • 1...Kh4
        • 2.Rh8#
      • 1...Sg3!
    • 1.Qh3+?
      • 1...Kg5
        • 2.Rf5#
        • 2.Qh5#
      • 1...Kxh3!
  • Keys
    • 1.Rf3!
      • threat
        • 2.Qh5#
      • 1...Kxf3
        • 2.Bh5#
      • 1...Kg5
        • 2.Qh5#
      • 1...Sf4
        • 2.Qxf4#
      • 1...Sg3
        • 2.Qxg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(c);P-FLIGHT::QAR1(A)
  • Tries
    • Try
      • R(D);CHECK
      • Vars
        • K(c);P-FLIGHT::QAB1(A)
      • Refutation
        • S(b);XR(D)
    • Try
      • R(D);CHECK
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);S_FLIGHT::R(D)
        • K(c);P-FLIGHT::R(D)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(A);CHECK
      • Vars
        • K(c);P-FLIGHT::R(D)
      • Refutation
        • S(a);P_SPINS(a)
    • Try
      • Q(A);CHECK
      • Refutation
        • K(c);S_FLIGHT,XQ(A)
  • Actual
    • R(D);
    • Threat
      • QAB1(A)
    • Vars
      • K(c);S_FLIGHT,XR(D)::B(C)
      • K(c);P-FLIGHT::QAR1(A)
      • S(b);N_GUARD::QAR1(A),XS(b)
      • S(a);N_GUARD::QAR1(A),XS(a)
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