MESON Chess Problem Database

Problem Display
PID: 160289 (7Q/8/1K6/2R5/kp6/8/N7/2n5 w - - 0 1)

Lincoln, Robert A

British Chess Magazine, 2006

7Q/8/1K6/2R5/kp6/8/N7/2n5

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...b3
      • 2.Ra5#
      • 2.Qa8#
  • Tries
    • 1.Sxc1?
      • threat
        • 2.Ra5#
        • 2.Qa1#
        • 2.Qa8#
      • 1...Ka3
        • 2.Ra5#
        • 2.Qa1#
      • 1...b3!
    • 1.Qb2?
      • threat
        • 2.Ra5#
        • 2.Qxb4#
      • 1...Sxa2
        • 2.Ra5#
        • 2.Qxa2#
      • 1...Sd3
        • 2.Ra5#
      • 1...b3
        • 2.Rc4#
        • 2.Ra5#
      • 1...Sb3!
    • 1.Qc3?
      • threat
        • 2.Ra5#
        • 2.Qxb4#
      • 1...Sxa2
        • 2.Ra5#
      • 1...Sb3
        • 2.Qxb4#
      • 1...b3
        • 2.Ra5#
        • 2.Qb4#
        • 2.Qa5#
      • 1...Sd3
        • 2.Ra5#
      • 1...bxc3!
  • Keys
    • 1.Qa1!
      • threat
        • 2.Sxc1#
      • 1...Ka3
        • 2.Sxc1#
      • 1...Kb3
        • 2.Sxc1#
      • 1...Sxa2
        • 2.Qxa2#
      • 1...Se2
        • 2.Sc1#
      • 1...Sb3
        • 2.Sc3#
      • 1...Sd3
        • 2.Sc1#
      • 1...b3
        • 2.Ra5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(A);XS(a)
      • Threat
        • DUALS(3)
      • Refutation
        • P(c);
    • Try
      • Q(D);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);::R1(B)
      • Refutation
        • S(a);
    • Try
      • Q(D);
      • Threat
        • DUALS(2)
      • Vars
        • S(a);XS(A)::R1(B)
        • S(a);::QAR1(D),XP(c)
        • S(a);::R1(B)
      • Refutation
        • P(c);XQ(D)
  • Actual
    • Q(D);
    • Threat
      • QAR(D)+S(A),XS(a)
    • Vars
      • K(b);P-FLIGHT::QAR(D)+S(A),XS(a)
      • K(b);S_FLIGHT::S(A),XS(a)
      • S(a);OGATE,P_SPINS(a),XS(A)::QAR2(D),XS(a)
      • S(a);::QAR(D)+S(A)
      • S(a);SBLOCK::QAR(D)+S(A),DCHECK
      • P(c);SBLOCK::R1(B)
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