MESON Chess Problem Database

Problem Display
PID: 175038 (8/8/5K2/3N4/2p1k3/5NP1/2Pb2Q1/8 w - - 0 1)

Allen, Edgar William

Boston Sunday Post, 1901

8/8/5K2/3N4/2p1k3/5NP1/2Pb2Q1/8

#2

6 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Be3
      • 2.Sc3#
  • Tries
    • 1.Sc3+?
      • 1...Ke3
        • 2.Qe2#
      • 1...Bxc3+!
    • 1.Qe2+?
      • 1...Be3
        • 2.Sc3#
      • 1...Kxd5!
  • Keys
    • 1.Sg5+!
      • 1...Kd4
        • 2.Se6#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • B(a);N_GUARD,SBLOCK::S(E)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(B)
      • Refutation
        • B(a);CHECK,XS(E)
    • Try
      • Q(B);CHECK
      • Vars
        • B(a);P_SPINB(a)::S(E)
      • Refutation
        • K(c);S_FLIGHT,XS(E)
  • Actual
    • S(C);CHECK
    • Vars
      • K(c);P-FLIGHT::S(C)
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