MESON Chess Problem Database

Problem Display
PID: 147095 (8/8/4Q3/8/5N2/b5n1/3p4/1K1k4 w - - 0 1)

Lincoln, Robert A

Australian Chess Problem Magazine, 1996

8/8/4Q3/8/5N2/b5n1/3p4/1K1k4

#2

3 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Sf1
      • 2.Qe2#
    • 1...Sh1
      • 2.Qe2#
    • 1...Se2
      • 2.Qxe2#
    • 1...Sf5
      • 2.Qe2#
    • 1...Sh5
      • 2.Qe2#
  • Tries
    • 1.Qg4+?
      • 1...Se2
        • 2.Qxe2#
      • 1...Ke1!
  • Keys
    • 1.Sd3!
      • threat
        • 2.Sf2#
      • 1...Se4
        • 2.Qg4#
      • 1...Bc5
        • 2.Sb2#
      • 1...Sh1
        • 2.Qg4#
      • 1...Se2
        • 2.Qb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • S(d);N_GUARD::QAB1(C)
    • S(d);N_GUARD::QAB1(C),XS(d)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • S(d);N_GUARD,P_SPINS(d)::QAB1(C),XS(d)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • S(d);N_GUARD::QAB(C)
      • B(c);N_GUARD::S(B)
      • S(d);SBLOCK::QAB(C)
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