MESON Chess Problem Database

Problem Display
PID: 138711 (8/5Q2/8/5R2/1n2kp2/8/8/2B2K2 w - - 0 1)

Lincoln, Robert A

StrateGems, 2010

8/5Q2/8/5R2/1n2kp2/8/8/2B2K2

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Sa2
      • 2.Qd5#
    • 1...Sc2
      • 2.Qd5#
    • 1...Sd3
      • 2.Qd5#
    • 1...Sd5
      • 2.Qxd5#
    • 1...Sa6
      • 2.Qd5#
    • 1...Sc6
      • 2.Qd5#
  • Tries
    • 1.Rxf4+?
      • 1...Kd3
        • 2.Qb3#
        • 2.Qc4#
      • 1...Ke5!
    • 1.Qc4+?
      • 1...Kf3
        • 2.Qxf4#
      • 1...Kxf5!
  • Keys
    • 1.Rc5!
      • 1...Kd3
        • 2.Qc4#
      • 1...Kf3
        • 2.Qxf4#
      • 1...Kd4
        • 2.Qc4#
      • 1...Sd5
        • 2.Qxd5#
      • 1...Sa2
        • 2.Qd5#
      • 1...Sc2
        • 2.Qd5#
      • 1...Sd3
        • 2.Qd5#
      • 1...Sa6
        • 2.Qd5#
      • 1...Sc6
        • 2.Qd5#
      • 1...f3
        • 2.Qc4#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(a);N_GUARD::QAB1(D)
    • S(a);N_GUARD::QAB1(D),XS(a)
  • Tries
    • Try
      • R(C);CHECK,XP(c)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);OGATE,P_SPINP(c),S_FLIGHT::QAR1(D),XP(c)
      • Refutation
        • K(b);S_FLIGHT,XR(C)
  • Actual
    • R(C);
    • Vars
      • K(b);S_FLIGHT::QAB1(D)
      • K(b);P_SPINP(c),S_FLIGHT::QAR1(D),XP(c)
      • K(b);P-FLIGHT::QAR1(D)
      • S(a);N_GUARD::QAB1(D),XS(a)
      • S(a);N_GUARD::QAB1(D)
      • P(c);SBLOCK::QAR2(D)
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