MESON Chess Problem Database

Problem Display
PID: 169251 (2R5/8/5B2/5Q2/1n6/p7/k7/3K4 w - - 0 1)

Lincoln, Robert A

SuperProblem, 2017

2R5/8/5B2/5Q2/1n6/p7/k7/3K4

#2

4 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sc2
      • 2.Qxc2#
    • 1...Sd5
      • 2.Qc2#
    • 1...Sa6
      • 2.Qc2#
    • 1...Sc6
      • 2.Qc2#
  • Tries
    • 1.Rc1?
      • threat
        • 2.Qb1#
      • 1...Sc2
        • 2.Qxc2#
        • 2.Qe6#
        • 2.Qd5#
      • 1...Sd3
        • 2.Qe6#
        • 2.Qd5#
      • 1...Kb3!
    • 1.Qd3?
      • 1...Sc2
        • 2.Qxc2#
      • 1...Sd5
        • 2.Qc2#
      • 1...Sa6
        • 2.Qc2#
      • 1...Sc6
        • 2.Qc2#
      • 1...Sxd3!
    • 1.Qe6+?
      • 1...Kb1
        • 2.Rc1#
        • 2.Qb3#
      • 1...Sd5!
    • 1.Qf2+?
      • 1...Kb1
        • 2.Rc1#
      • 1...Sc2
        • 2.Qxc2#
      • 1...Kb3!
    • 1.Qd5+?
      • 1...Kb1
        • 2.Rc1#
        • 2.Qb3#
      • 1...Sxd5!
  • Keys
    • 1.Rb8!
      • 1...Kb3
        • 2.Qc2#
      • 1...Sc2
        • 2.Qxc2#
        • 2.Qe6#
        • 2.Qd5#
      • 1...Sd3
        • 2.Qe6#
        • 2.Qd5#
      • 1...Sd5
        • 2.Qb1#
        • 2.Qc2#
        • 2.Qf2#
        • 2.Qxd5#
      • 1...Sa6
        • 2.Qb1#
        • 2.Qc2#
        • 2.Qe6#
        • 2.Qf2#
        • 2.Qd5#
      • 1...Sc6
        • 2.Qb1#
        • 2.Qc2#
        • 2.Qe6#
        • 2.Qf2#
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • S(c);N_GUARD::QAR2(B),XS(c)
    • S(c);N_GUARD::QAR2(B)
  • Tries
    • Try
      • R(D);
      • Threat
        • QAB1(B)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(B);
      • Vars
        • S(c);N_GUARD::QAR2(B),XS(c)
        • S(c);N_GUARD::QAR2(B)
      • Refutation
        • S(c);XQ(B)
    • Try
      • Q(B);CHECK
      • Refutation
        • S(c);P_SPINS(c)
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);S_FLIGHT::R1(D)
        • S(c);N_GUARD,P_SPINS(c)::QAR2(B),XS(c)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Refutation
        • S(c);XQ(B)
  • Actual
    • R(D);
    • Vars
      • K(a);P_SPINS(c),S_FLIGHT::QAB1(B)
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