MESON Chess Problem Database

Problem Display
PID: 234609 (8/8/8/3p4/4k1P1/2Q1P3/2n1K3/8 w - - 0 1)

Lincoln, Robert A

Kudesnik, 2002

8/8/8/3p4/4k1P1/2Q1P3/2n1K3/8

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sa1
      • 2.Qd4#
    • 1...Se1
      • 2.Qd4#
    • 1...Sa3
      • 2.Qd4#
    • 1...Sxe3
      • 2.Qxe3#
    • 1...Sb4
      • 2.Qd4#
    • 1...Sd4+
      • 2.Qxd4#
  • Tries
    • 1.Kf2?
      • 1...Sxe3
        • 2.Qxe3#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Sa1
        • 2.Qd4#
      • 1...Se1
        • 2.Qd4#
      • 1...Sa3
        • 2.Qd4#
      • 1...Sb4
        • 2.Qd4#
      • 1...d4!
    • 1.Qf6?
      • threat
        • 2.Qe7#
        • 2.Qf4#
        • 2.Qf5#
        • 2.Qe6#
      • 1...Sd4+
        • 2.Qxd4#
      • 1...d4
        • 2.Qf5#
        • 2.Qe6#
      • 1...Sxe3!
  • Keys
    • 1.Qc5!
      • threat
        • 2.Qe7#
      • 1...Sd4+
        • 2.Qxd4#
      • 1...Ke5
        • 2.Qe7#
      • 1...Sxe3
        • 2.Qxe3#
      • 1...d4
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • S(a);N_GUARD::QAR1(B)
    • S(a);OGATE,XP(C)::QAR1(B),XS(a)
    • S(a);CHECK,N_GUARD::QAR1(B),XS(a)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • S(a);OGATE,XP(C)::QAR1(B),XS(a)
        • S(a);N_GUARD::QAR1(B),XS(a)
        • S(a);N_GUARD::QAR1(B)
      • Refutation
        • P(c);
    • Try
      • Q(B);
      • Threat
        • DUALS(4)
      • Vars
        • S(a);CHECK,N_GUARD::QAR1(B),XS(a)
      • Refutation
        • S(a);XP(C)
  • Actual
    • Q(B);
    • Threat
      • QAR(B)
    • Vars
      • S(a);CHECK,N_GUARD::QAR1(B),XS(a)
      • K(b);P-FLIGHT,P_SPINP(c)::QAR2(B)
      • S(a);OGATE,XP(C)::QAR1(B),XS(a)
      • P(c);OGATE::QAB1(B)
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