MESON Chess Problem Database

Problem Display
PID: 234627 (4k3/4p3/2K4n/1p6/8/1Q6/8/5R2 w - - 0 1)

Lincoln, Robert A

Kudesnik, 2004

4k3/4p3/2K4n/1p6/8/1Q6/8/5R2

#2

3 + 4

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kd8
      • 2.Rf8#
    • 1...Sg4
      • 2.Qg8#
    • 1...Sf5
      • 2.Qg8#
    • 1...Sg8
      • 2.Qxg8#
  • Tries
    • 1.Qd5?
      • threat
        • 2.Qd7#
      • 1...Sf5
        • 2.Qg8#
      • 1...Sf7!
    • 1.Qe6?
      • threat
        • 2.Qd7#
        • 2.Qc8#
      • 1...Kd8
        • 2.Rf8#
        • 2.Qd7#
      • 1...Sf5
        • 2.Qg8#
      • 1...Sf7!
    • 1.Qf7+?
      • 1...Kd8
        • 2.Qf8#
      • 1...Sxf7!
  • Keys
    • 1.Kc7!
      • threat
        • 2.Qxb5#
      • 1...Sf5
        • 2.Qg8#
      • 1...Sf7
        • 2.Qxf7#
      • 1...e5
        • 2.Qe6#
      • 1...e6
        • 2.Qxe6#
      • 1...b4
        • 2.Qa4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • K(d);P-FLIGHT::R(A)
    • S(b);N_GUARD::QAR2(B)
    • S(b);N_GUARD::QAR2(B),XS(b)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAB1(B)
      • Vars
        • S(b);N_GUARD::QAR2(B)
      • Refutation
        • S(b);
    • Try
      • Q(B);P_PINP(c)
      • Threat
        • DUALS(2)
      • Vars
        • S(b);N_GUARD::QAR2(B)
      • Refutation
        • S(b);
    • Try
      • Q(B);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR2(B)
      • Refutation
        • S(b);XQ(B)
  • Actual
    • K(C);P-FLIGHT
    • Threat
      • QAB(B),XP(a)
    • Vars
      • S(b);N_GUARD::QAR2(B)
      • S(b);N_GUARD::QAB1(B),XS(b)
      • P(c);OGATEB::QAR2(B)
      • P(c);OGATEB::QAR2(B),XP(c)
      • P(a);OGATEB::QAB(B)
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