MESON Chess Problem Database

Problem Display
PID: 238583 (8/8/8/3p4/4k1K1/2R1P3/Q6b/8 w - - 0 1)

Lincoln, Robert A

Problemist Ukraini, 2016

8/8/8/3p4/4k1K1/2R1P3/Q6b/8

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Be5
      • 2.Qb1#
      • 2.Qc2#
      • 2.Qg2#
  • Tries
    • 1.Qd2?
      • threat
        • 2.Qd4#
      • 1...d4
        • 2.Qxd4#
      • 1...Be5
        • 2.Qc2#
        • 2.Qg2#
        • 2.Qd3#
      • 1...Ke5!
    • 1.Qf2?
      • threat
        • 2.Qf5#
      • 1...Bf4
        • 2.Qxf4#
      • 1...Ke5!
    • 1.Qa4+?
      • 1...d4
        • 2.Qxd4#
      • 1...Ke5!
  • Keys
    • 1.Qa7!
      • threat
        • 2.Qd4#
      • 1...Ke5
        • 2.Qe7#
      • 1...d4
        • 2.Qxd4#
      • 1...Be5
        • 2.Qh7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • P(c);::QAR1(A),XP(c)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • B(a);N_GUARD::QAR1(A),XB(a)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • P(c);P_SPINP(c)::QAR1(A),XP(c)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(A);
    • Threat
      • QAR1(A)
    • Vars
      • K(b);P-FLIGHT::QAR2(A)
      • P(c);::QAR1(A),XP(c)
      • B(a);SBLOCK::QAB(A)
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