MESON Chess Problem Database

Problem Display
PID: 168904 (5r2/8/1pQ1P1p1/b2R4/3Nk1p1/6P1/5P2/1K6 w - - 0 1)

Challenger, Alfred Clement

Source?, 1903

5r2/8/1pQ1P1p1/b2R4/3Nk1p1/6P1/5P2/1K6

#2

7 + 6

14868 Pirnie Collection 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Kd3
      • 2.Qc2#
  • Tries
    • 1.Rc5+?
      • 1...Kxd4
        • 2.Qd5#
      • 1...Kd3!
    • 1.Rd6+?
      • 1...Kd3
        • 2.Qc2#
      • 1...Ke5!
    • 1.Rd7+?
      • 1...Kd3
        • 2.Qc2#
      • 1...Ke5!
    • 1.Rd8+?
      • 1...Kd3
        • 2.Qc2#
      • 1...Ke5!
  • Keys
    • 1.Sf3!
      • threat
        • 2.Sg5#
      • 1...Kxf3
        • 2.Rd2#
      • 1...Rxf3
        • 2.Qc4#
      • 1...gxf3
        • 2.Qc4#
      • 1...Rf5
        • 2.Rd4#
      • 1...Bd2
        • 2.Sxd2#
      • 1...g5
        • 2.Sxg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • K(a);S_FLIGHT::QAB1(F)
  • Tries
    • Try
      • R(E);CHECK
      • Vars
        • K(a);P-FLIGHT,XS(D)::QAR1(F)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • R(E);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(F)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(E);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(F)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • R(E);CHECK
      • Vars
        • K(a);S_FLIGHT::QAB1(F)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • S(D);
    • Threat
      • S(D)
    • Vars
      • K(a);S_FLIGHT,XS(D)::QAB(F)+R(E)
      • R(f);SBLOCK,XS(D)::QAR2(F)
      • P(b);SBLOCK,XS(D)::QAR2(F)
      • R(f);SBLOCK::QAB(F)+R(E),DCHECK
      • B(c);N_GUARD::S(D),XB(c)
      • P(e);::S(D),XP(e)
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Developed and maintained by Brian Stephenson.
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