MESON Chess Problem Database

Problem Display
PID: 51886 (5R2/8/8/8/8/7Q/7q/4KBrk w - - 0 1)

Neyndorff, Luke

StrateGems, 2004

5R2/8/8/8/8/7Q/7q/4KBrk

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf1+
      • 2.Rxf1#
  • Tries
    • 1.Qf3+?
      • 1...Qg2
        • 2.Rh8#
      • 1...Rg2!
  • Keys
    • 1.Rh8!
      • threat
        • 2.Qxh2#
      • 1...Rxf1+
        • 2.Qxf1#
      • 1...Qxh3
        • 2.Rxh3#
      • 1...Rg2
        • 2.Qxg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(a);CHECK,OGATE,XB(B)::R(D),XR(a)
  • Tries
    • Try
      • Q(C);CHECK,N_PINQ(c)
      • Vars
        • Q(c);P_SPINQ(c),S_CUTR(a)::R(D)
      • Refutation
        • R(a);N_PINB(B),P_SPINR(a)
  • Actual
    • R(D);
    • Threat
      • QAR1(C),XQ(c)
    • Vars
      • R(a);CHECK,OGATE,XB(B)::QAR2(C),XR(a)
      • Q(c);OGATE,XQ(C)::R(D),XQ(c)
      • R(a);N_GUARD,N_PINB(B)::QAB1(C),XR(a)
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