MESON Chess Problem Database

Problem Display
PID: 180655 (2k5/1R2Q3/5nK1/8/2rn4/8/8/8 w - - 0 1)

Lincoln, Robert A

StrateGems, 2017

2k5/1R2Q3/5nK1/8/2rn4/8/8/8

#2

3 + 4

SOLUTION

  • SOUND
  • Sets
    • 1...Ra4
      • 2.Qc7#
    • 1...Rb4
      • 2.Qc7#
    • 1...Rc7
      • 2.Qxc7#
    • 1...Sc6
      • 2.Qc7#
    • 1...Se4
      • 2.Qd7#
    • 1...Sg4
      • 2.Qd7#
    • 1...Sd5
      • 2.Qd7#
    • 1...Sh5
      • 2.Qd7#
    • 1...Sd7
      • 2.Qxd7#
    • 1...Sh7
      • 2.Qd7#
    • 1...Se8
      • 2.Qd7#
    • 1...Sg8
      • 2.Qd7#
  • Tries
    • 1.Kxf6?
      • threat
        • 2.Qd7#
      • 1...Rc7
        • 2.Qxc7#
      • 1...Rc6+!
    • 1.Rc7+?
      • 1...Kb8
        • 2.Qd8#
      • 1...Rxc7!
    • 1.Qd6?
      • threat
        • 2.Rb8#
        • 2.Qb8#
      • 1...Sd7
        • 2.Qxd7#
      • 1...Rb4
        • 2.Qc7#
        • 2.Qb8#
      • 1...Rc7
        • 2.Qxc7#
      • 1...Sc6
        • 2.Qc7#
      • 1...Kxb7!
  • Keys
    • 1.Ra7!
      • threat
        • 2.Ra8#
      • 1...Kb8
        • 2.Qb7#
      • 1...Ra4
        • 2.Qc7#
      • 1...Rb4
        • 2.Qc7#
      • 1...Rc7
        • 2.Qxc7#
      • 1...Sc6
        • 2.Qc7#
      • 1...Sd7
        • 2.Qe8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 7
  • Sets
    • R(a);N_GUARD::QAR1(C)
    • R(a);N_GUARD::QAR1(C),XR(a)
    • S(b);S_CUTR(a)::QAR1(C)
    • S(c);N_GUARD::QAB1(C)
    • S(c);N_GUARD::QAB1(C),XS(c)
  • Tries
    • Try
      • K(A);P-FLIGHT,XS(c)
      • Threat
        • QAB1(C)
      • Vars
        • R(a);N_GUARD::QAR1(C),XR(a)
      • Refutation
        • R(a);CHECK
    • Try
      • R(B);CHECK
      • Vars
        • K(d);P-FLIGHT::QAR2(C)
      • Refutation
        • R(a);XR(B)
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • S(c);N_GUARD::QAB1(C),XS(c)
        • R(a);N_GUARD::QAR1(C),XR(a)
        • S(b);S_CUTR(a)::QAR1(C)
      • Refutation
        • K(d);S_FLIGHT,XR(B)
  • Actual
    • R(B);
    • Threat
      • R(B)
    • Vars
      • K(d);P-FLIGHT::QAR1(C)
      • R(a);N_GUARD::QAR1(C)
      • R(a);N_GUARD::QAR1(C),XR(a)
      • S(b);S_CUTR(a)::QAR1(C)
      • S(c);N_GUARD::QAR2(C)
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