MESON Chess Problem Database

Problem Display
PID: 71526 (1K6/n2B4/k7/8/1Q6/2R5/8/q7 w - - 0 1)

Lincoln, Robert A

Problem Observer, 2007

1K6/n2B4/k7/8/1Q6/2R5/8/q7

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Qb1
      • 2.Ra3#
    • 1...Qe1
      • 2.Ra3#
    • 1...Qf1
      • 2.Ra3#
    • 1...Qg1
      • 2.Ra3#
    • 1...Qh1
      • 2.Ra3#
    • 1...Qa3
      • 2.Rxa3#
    • 1...Qa5
      • 2.Qb7#
    • 1...Sb5
      • 2.Rc6#
      • 2.Qxb5#
    • 1...Sc6+
      • 2.Rxc6#
    • 1...Sc8
      • 2.Bxc8#
      • 2.Qb5#
  • Tries
    • 1.Bb5+?
      • 1...Sxb5
        • 2.Rc6#
      • 1...Kb6!
  • Keys
    • 1.Bc6!
      • threat
        • 2.Bb7#
      • 1...Sxc6+
        • 2.Rxc6#
      • 1...Sb5
        • 2.Qxb5#
      • 1...Qh1
        • 2.Ra3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • Q(a);N_GUARD,P_PINQ(B)::R(A)
    • Q(a);N_GUARD::R(A)
    • Q(a);N_GUARD::R(A),XQ(a)
    • Q(a);SBLOCK::QAB1(B)
    • S(c);CHECK,N_GUARD::R(A),XS(c)
  • Tries
    • Try
      • B(C);CHECK
      • Vars
        • S(c);XB(C)::R(A)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • B(C);
    • Threat
      • B(C)
    • Vars
      • S(c);CHECK,OGATE,XB(C)::R(A),XS(c)
      • S(c);N_GUARD::QAB1(B),XS(c)
      • Q(a);N_GUARD::R(A)
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