MESON Chess Problem Database

Problem Display
PID: 934 (2Q5/3K1N2/p3rp2/3Npk1P/r7/5P2/8/8 w - - 0 1)

Lincoln, Robert A

The Problemist Supplement, 1993

2Q5/3K1N2/p3rp2/3Npk1P/r7/5P2/8/8

#2

6 + 6

SOLUTION

  • SOUND
  • Sets
    • 1...Rf4
      • 2.Se3#
    • 1...Rc6
      • 2.Kxc6#
    • 1...Rd6+
      • 2.Kxd6#
    • 1...Re7+
      • 2.Kxe7#
    • 1...Re8
      • 2.Kxe8#
  • Tries
    • 1.Qc2+?
      • 1...Re4
        • 2.Qxe4#
      • 1...e4!
    • 1.Qg8?
      • threat
        • 2.Sh6#
        • 2.Qh7#
        • 2.Qg6#
      • 1...Rd6+
        • 2.Sxd6#
      • 1...Rg4
        • 2.Sh6#
        • 2.Qxg4#
      • 1...e4
        • 2.Qh7#
        • 2.Qg4#
        • 2.Qg6#
      • 1...Re7+!
  • Keys
    • 1.Qc1!
      • threat
        • 2.Sh6#
      • 1...Rd6+
        • 2.Sxd6#
      • 1...Re7+
        • 2.Sxe7#
      • 1...Rf4
        • 2.Se3#
      • 1...e4
        • 2.Qf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • R(a);SBLOCK::S(B)
    • R(e);::QAB(F)+K(D),XR(e)
    • R(e);CHECK::QAB(F)+K(D),XR(e)
  • Tries
    • Try
      • Q(F);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::QAB1(F),XR(a)
      • Refutation
        • P(b);P_SPINP(b)
    • Try
      • Q(F);
      • Threat
        • DUALS(3)
      • Vars
        • R(e);CHECK,N_GUARD::S(E),XR(e)
      • Refutation
        • R(e);CHECK
  • Actual
    • Q(F);
    • Threat
      • S(E)
    • Vars
      • R(e);CHECK,N_GUARD::S(E),XR(e)
      • R(e);CHECK,N_GUARD::S(B),XR(e)
      • R(a);SBLOCK::S(B)
      • P(b);N_GUARD,S_CUTR(a)::QAR1(F)
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