MESON Chess Problem Database

Problem Display
PID: 138318 (N3k3/2Q3K1/2b5/8/R7/8/8/8 w - - 0 1)

Lincoln, Robert A

Comm., The Problemist, 2010

N3k3/2Q3K1/2b5/8/R7/8/8/8

#2

4 + 2

145 StrateGems 2011
56 The Problemist 2011
145 StrateGems 2012

SOLUTION

  • SOUND
  • Sets
    • 1...Be4
      • 2.Rxe4#
    • 1...Bb5
      • 2.Re4#
    • 1...Bxa8
      • 2.Rxa8#
  • Tries
    • 1.Kf6?
      • threat
        • 2.Qe7#
        • 2.Qc8#
      • 1...Kf8
        • 2.Qf7#
      • 1...Bb7
        • 2.Qe7#
      • 1...Bd7!
    • 1.Sb6?
      • 1...Bd7
        • 2.Qxd7#
      • 1...Bh1
        • 2.Qd7#
      • 1...Bg2
        • 2.Qd7#
      • 1...Bf3
        • 2.Qd7#
      • 1...Be4
        • 2.Rxe4#
        • 2.Qd7#
      • 1...Bb5
        • 2.Re4#
        • 2.Ra8#
      • 1...Bd5
        • 2.Qd7#
      • 1...Bb7
        • 2.Qd7#
      • 1...Ba8
        • 2.Rxa8#
        • 2.Qd7#
      • 1...Bxa4!
    • 1.Rd4?
      • threat
        • 2.Rd8#
        • 2.Qe5#
        • 2.Qd8#
        • 2.Qf7#
      • 1...Bd7
        • 2.Qxd7#
      • 1...Bd5!
    • 1.Ra7?
      • threat
        • 2.Qb8#
        • 2.Qe7#
        • 2.Qc8#
      • 1...Bd7
        • 2.Qxd7#
      • 1...Bb7!
  • Keys
    • 1.Qd6!
      • threat
        • 2.Sc7#
      • 1...Bxa8
        • 2.Rxa8#
      • 1...Bd7
        • 2.Qf8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • B(a);N_GUARD::R(A),XB(a)
    • B(a);N_GUARD::R(A)
    • B(a);OGATE,XS(D)::R(A),XB(a)
  • Tries
    • Try
      • K(C);S_FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • K(b);P-FLIGHT::QAR1(B)
        • B(a);::QAR1(B)
      • Refutation
        • B(a);
    • Try
      • S(D);
      • Vars
        • B(a);N_GUARD::QAB1(B),XB(a)
        • B(a);N_GUARD::QAB1(B)
      • Refutation
        • B(a);XR(A)
    • Try
      • R(A);
      • Threat
        • DUALS(4)
      • Vars
        • B(a);N_GUARD::QAB1(B),XB(a)
      • Refutation
        • B(a);
    • Try
      • R(A);
      • Threat
        • DUALS(3)
      • Vars
        • B(a);N_GUARD::QAB1(B),XB(a)
      • Refutation
        • B(a);
  • Actual
    • Q(B);
    • Threat
      • S(D)
    • Vars
      • B(a);OGATE,XS(D)::R(A),XB(a)
      • B(a);SBLOCK::QAR1(B)
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