MESON Chess Problem Database

Problem Display
PID: 223254 (Q7/1K6/4p3/3NpN1P/3nkn2/4P3/4B3/3R1R2 w - - 0 1)

Jackson, Harry S

English Mechanic and World of Science, 1885

(First published on Fri Jun 26 1885)

Q7/1K6/4p3/3NpN1P/3nkn2/4P3/4B3/3R1R2

#2

9 + 5

6490 yacpdb 2020
15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd5
      • 2.Kb6#
    • 1...Sc2
      • 2.Sg3#
      • 2.Sd6#
    • 1...Sdxe2
      • 2.Sd6#
    • 1...Sb3
      • 2.Sg3#
      • 2.Sd6#
    • 1...Sf3
      • 2.Sg3#
      • 2.Sd6#
    • 1...Sb5
      • 2.Sg3#
    • 1...Sxf5
      • 2.Bf3#
    • 1...Sc6
      • 2.Sg3#
      • 2.Sd6#
    • 1...Sfxe2
      • 2.Sf6#
    • 1...Sg2
      • 2.Sc3#
      • 2.Sf6#
    • 1...Sd3
      • 2.Sc3#
      • 2.Sf6#
    • 1...Sh3
      • 2.Sc3#
      • 2.Sf6#
    • 1...Sxd5
      • 2.Bd3#
    • 1...Sxh5
      • 2.Sc3#
    • 1...Sg6
      • 2.Sc3#
      • 2.Sf6#
  • Tries
    • 1.Bd3+?
      • 1...Sxd3
        • 2.Sc3#
        • 2.Sf6#
      • 1...Kxd5!
    • 1.Bf3+?
      • 1...Sxf3
        • 2.Sg3#
        • 2.Sd6#
      • 1...Kxf5!
    • 1.Rxf4+?
      • 1...Kxd5
        • 2.Kb6#
        • 2.Qa5#
      • 1...exf4!
  • Keys
    • 1.Qe8!
      • 1...Kxd5
        • 2.Qc6#
      • 1...Kxf5
        • 2.Qg6#
      • 1...Sdxe2
        • 2.Sd6#
      • 1...Sxf5
        • 2.Bf3#
      • 1...Sfxe2
        • 2.Sf6#
      • 1...Sxd5
        • 2.Bd3#
      • 1...Sxh5
        • 2.Sc3#
      • 1...exd5
        • 2.Rxf4#
      • 1...exf5
        • 2.Rxd4#
      • 1...Sc2
        • 2.Sg3#
        • 2.Sd6#
      • 1...Sb3
        • 2.Sg3#
        • 2.Sd6#
      • 1...Sf3
        • 2.Sg3#
        • 2.Sd6#
      • 1...Sb5
        • 2.Sg3#
      • 1...Sc6
        • 2.Sg3#
        • 2.Sd6#
      • 1...Sg2
        • 2.Sc3#
        • 2.Sf6#
      • 1...Sd3
        • 2.Sc3#
        • 2.Sf6#
      • 1...Sh3
        • 2.Sc3#
        • 2.Sf6#
      • 1...Sg6
        • 2.Sc3#
        • 2.Sf6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(b);P_SPINS(a),S_FLIGHT,XS(E)::QAB(I)+K(H)
    • S(a);XB(C)::S(F)
    • S(a);::S(F)
    • S(a);N_GUARD,SBLOCK,XS(F)::B(C)
    • S(c);XB(C)::S(E)
    • S(c);N_GUARD,SBLOCK,XS(E)::B(C)
    • S(c);XP(G)::S(E)
  • Tries
    • Try
      • B(C);CHECK
      • Refutation
        • K(b);S_FLIGHT,XS(E)
    • Try
      • B(C);CHECK
      • Refutation
        • K(b);S_FLIGHT,XS(F)
    • Try
      • R(B);CHECK,XS(c)
      • Refutation
        • P(d);XR(B)
  • Actual
    • Q(I);
    • Vars
      • K(b);OGATEB,P_SPINS(a),S_FLIGHT,XS(E)::QAB1(I)
      • K(b);OGATEB,P_SPINS(c),S_FLIGHT,XS(F)::QAB1(I)
      • S(a);XB(C)::S(F)
      • S(a);N_GUARD,SBLOCK,XS(F)::B(C)
      • S(c);XB(C)::S(E)
      • S(c);N_GUARD,SBLOCK,XS(E)::B(C)
      • S(c);XP(G)::S(E)
      • P(e);P_SPINP(d),SBLOCK,XS(E)::R1(B),XS(c)
      • P(e);P_SPINP(d),SBLOCK,XS(F)::R1(A),XS(a)
      • S(a);::S(F)
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