MESON Chess Problem Database

Problem Display
PID: 208026 (1B1n4/p1Ppp3/3p1q2/RN2k1b1/8/3K4/5PPN/8 w - - 0 1)

Spear, JM

Dubuque Chess Journal, 1873

1B1n4/p1Ppp3/3p1q2/RN2k1b1/8/3K4/5PPN/8

#2

8 + 8

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kd5
      • 2.Sd4#
  • Tries
    • 1.Sa3+?
      • 1...Kf4
        • 2.g3#
      • 1...Ke6
        • 2.cxd8S#
      • 1...d5!
    • 1.Sc3+?
      • 1...Kf4
        • 2.Se2#
        • 2.g3#
      • 1...Ke6
        • 2.cxd8S#
      • 1...d5!
    • 1.Sd4+?
      • 1...Kf4
        • 2.Se2#
        • 2.g3#
      • 1...d5!
    • 1.Sxa7+?
      • 1...Kf4
        • 2.g3#
      • 1...Ke6
        • 2.cxd8S#
      • 1...d5!
  • Keys
    • 1.Sxd6+!
      • 1...Kf4
        • 2.g3#
      • 1...Kxd6
        • 2.cxd8S#
      • 1...Ke6
        • 2.cxd8S#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • K(a);P-FLIGHT::R(E)+S(F)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(a);S_FLIGHT::P(B)
        • K(a);P-FLIGHT::PXS(h)=S
      • Refutation
        • P(c);P_SPINP(c)
    • Try
      • S(F);CHECK
      • Vars
        • K(a);P-FLIGHT::PXS(h)=S
      • Refutation
        • P(c);P_SPINP(c)
    • Try
      • S(F);CHECK
      • Refutation
        • P(c);P_SPINP(c)
    • Try
      • S(F);CHECK,XP(e)
      • Vars
        • K(a);S_FLIGHT::P(B)
        • K(a);P-FLIGHT::PXS(h)=S
      • Refutation
        • P(c);P_SPINP(c)
  • Actual
    • S(F);CHECK,XP(c)
    • Vars
      • K(a);S_FLIGHT::P(B)
      • K(a);S_FLIGHT,XS(F)::PXS(h)=S
      • K(a);P-FLIGHT::PXS(h)=S
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