MESON Chess Problem Database

Problem Display
PID: 138719 (7Q/8/8/7B/8/pK6/1bR5/1k6 w - - 0 1)

Lincoln, Robert A

StrateGems, 2010

7Q/8/8/7B/8/pK6/1bR5/1k6

#2

4 + 3

56 The Problemist 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Ka1
      • 2.Rc1#
    • 1...a2
      • 2.Qxb2#
  • Tries
    • 1.Rc1+?
      • 1...Bxc1
        • 2.Bg6#
      • 1...Kxc1!
    • 1.Rxb2+?
      • 1...Kc1
        • 2.Qc3#
        • 2.Qh6#
        • 2.Qc8#
      • 1...axb2
        • 2.Qxb2#
      • 1...Ka1!
    • 1.Qc3?
      • 1...Ka1
        • 2.Rc1#
      • 1...Bc1
        • 2.Rxc1#
      • 1...Ba1
        • 2.Rc1#
        • 2.Qe1#
      • 1...a2
        • 2.Qxb2#
      • 1...Bxc3!
  • Keys
    • 1.Rd2!
      • 1...Ka1
        • 2.Rd1#
      • 1...Kc1
        • 2.Rd1#
      • 1...Bxh8
        • 2.Rd1#
      • 1...Bc1
        • 2.Bg6#
      • 1...Ba1
        • 2.Rd1#
      • 1...Bc3
        • 2.Rd1#
      • 1...Bd4
        • 2.Rd1#
      • 1...Be5
        • 2.Rd1#
      • 1...Bf6
        • 2.Rd1#
      • 1...Bg7
        • 2.Rd1#
      • 1...a2
        • 2.Qxb2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 9
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT,P_SPINB(b)::R(A)
    • P(c);N_GUARD::QAR1(D),XB(b)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • B(b);SBLOCK,XR(A)::B(C)
      • Refutation
        • K(a);P-FLIGHT,XR(A)
    • Try
      • R(A);CHECK,XB(b)
      • Vars
        • P(c);OGATE,XR(A)::QAR1(D),XP(c)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(D);
      • Vars
        • K(a);P-FLIGHT,P_SPINB(b)::R(A)
        • B(b);N_GUARD::R1(A),XB(b)
        • P(c);N_GUARD::QAR1(D),XB(b)
      • Refutation
        • B(b);XQ(D)
  • Actual
    • R(A);
    • Vars
      • K(a);P-FLIGHT,P_SPINB(b)::R(A)
      • K(a);P-FLIGHT::R1(A)
      • B(b);N_GUARD,XQ(D)::R(A)
      • B(b);SBLOCK::B(C)
      • B(b);N_GUARD::R(A)
      • P(c);N_GUARD::QAR1(D),XB(b)
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