MESON Chess Problem Database

Problem Display
PID: 933 (3rk1K1/6n1/2N1B3/8/6p1/8/8/7Q w - - 0 1)

Lincoln, Robert A

The Problemist Supplement, 1993

3rk1K1/6n1/2N1B3/8/6p1/8/8/7Q

#2

4 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Sf5
      • 2.Qh5#
    • 1...Sh5
      • 2.Qxh5#
  • Tries
    • 1.Kxg7?
      • threat
        • 2.Qh5#
        • 2.Qh8#
      • 1...Rd5
        • 2.Qh8#
      • 1...Rd7+!
    • 1.Qf1?
      • threat
        • 2.Qf7#
        • 2.Qf8#
      • 1...Sxe6
        • 2.Qf7#
      • 1...Rd7
        • 2.Qf8#
      • 1...Sf5!
    • 1.Qh4?
      • threat
        • 2.Qe7#
        • 2.Qxd8#
      • 1...Sxe6
        • 2.Qe7#
      • 1...Rd1
        • 2.Qe7#
      • 1...Rd2
        • 2.Qe7#
      • 1...Rd3
        • 2.Qe7#
      • 1...Rd4
        • 2.Qe7#
      • 1...Rd5
        • 2.Qe7#
      • 1...Rd6
        • 2.Qe7#
      • 1...Ra8
        • 2.Qe7#
      • 1...Rb8
        • 2.Qe7#
      • 1...Rc8
        • 2.Qe7#
      • 1...Sf5
        • 2.Qxd8#
        • 2.Qh5#
      • 1...Rd7!
    • 1.Qh6?
      • threat
        • 2.Qg6#
      • 1...Sxe6
        • 2.Qxe6#
      • 1...Rd7!
    • 1.Qh7?
      • threat
        • 2.Qg6#
      • 1...Sxe6
        • 2.Qe7#
        • 2.Qf7#
      • 1...Rd7!
    • 1.Qh8?
      • threat
        • 2.Kxg7#
        • 2.Kh7#
      • 1...Rd7
        • 2.Kh7#
      • 1...Sf5
        • 2.Kh7#
        • 2.Qh5#
      • 1...Sh5
        • 2.Kh7#
        • 2.Qxh5#
      • 1...Sxe6!
  • Keys
    • 1.Qe4!
      • threat
        • 2.Qg6#
      • 1...Sxe6
        • 2.Qxe6#
      • 1...Rd7
        • 2.Bf7#
      • 1...Sf5
        • 2.Bxf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • S(b);N_GUARD::QAB(A)
    • S(b);N_GUARD::QAB(A),XS(b)
  • Tries
    • Try
      • K(D);P-FLIGHT,XS(b)
      • Threat
        • DUALS(2)
      • Vars
        • R(c);::QAR(A)
      • Refutation
        • R(c);CHECK
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);XB(C)::QAB1(A)
        • R(c);::QAR1(A)
      • Refutation
        • S(b);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(b);XB(C)::QAR1(A)
        • R(c);::QAR1(A)
      • Refutation
        • R(c);
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Vars
        • S(b);OGATE,XB(C)::QAR2(A),XS(b)
      • Refutation
        • R(c);
    • Try
      • Q(A);
      • Threat
        • QAB(A)
      • Refutation
        • R(c);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • R(c);::QAR(A)+K(D)
      • Refutation
        • S(b);XB(C)
  • Actual
    • Q(A);
    • Threat
      • QAB(A)
    • Vars
      • S(b);OGATE,P_SPINS(b),XB(C)::QAR2(A),XS(b)
      • R(c);SBLOCK::QAR(A)+B(C),DCHECK
      • S(b);N_GUARD::QAR(A)+B(C),XS(b)
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