MESON Chess Problem Database

Problem Display
PID: 234794 (8/1R6/6Q1/2p5/2kN4/4K3/8/2n5 w - - 0 1)

Lincoln, Robert A

Kudesnik, 2017

8/1R6/6Q1/2p5/2kN4/4K3/8/2n5

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kc3
      • 2.Qc2#
    • 1...Kd5
      • 2.Qe6#
  • Tries
    • 1.Se2?
      • threat
        • 2.Qe4#
        • 2.Qf7#
        • 2.Qe6#
        • 2.Qg8#
      • 1...Sxe2
        • 2.Qd3#
      • 1...Sb3
        • 2.Qd3#
        • 2.Qf7#
        • 2.Qe6#
        • 2.Qg8#
      • 1...Kd5!
    • 1.Qe4?
      • threat
        • 2.Se2#
      • 1...cxd4+
        • 2.Qxd4#
      • 1...Kc3
        • 2.Qc2#
      • 1...Se2
        • 2.Sxe2#
      • 1...Sb3!
    • 1.Qa6+?
      • 1...Kd5
        • 2.Qe6#
      • 1...Kc3!
  • Keys
    • 1.Qb6!
      • 1...cxd4+
        • 2.Qxd4#
      • 1...Kc3
        • 2.Qxc5#
      • 1...Kd5
        • 2.Qe6#
      • 1...Sa2
        • 2.Qb3#
      • 1...Se2
        • 2.Qb3#
      • 1...Sb3
        • 2.Qxb3#
      • 1...Sd3
        • 2.Qb3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT::QAR1(C)
    • K(b);S_FLIGHT::QAB1(C)
  • Tries
    • Try
      • S(B);
      • Threat
        • DUALS(4)
      • Vars
        • S(a);N_GUARD,XS(B)::QAB1(C)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(C);
      • Threat
        • QAR(C)+S(B)
      • Vars
        • P(c);CHECK,OGATE,P_SPINP(c),XS(B)::QAR1(C),XP(c)
        • K(b);P-FLIGHT::QAR1(C)
        • S(a);::QAR(C)+S(B),XS(a)
      • Refutation
        • S(a);
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);S_FLIGHT::QAB1(C)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(C);
    • Vars
      • P(c);CHECK,OGATE,XS(B)::QAR1(C),XP(c)
      • K(b);P-FLIGHT::QAR2(C),XP(c)
      • K(b);S_FLIGHT::QAB1(C)
      • S(a);N_GUARD::QAB1(C)
      • S(a);N_GUARD::QAB1(C),XS(a)
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