MESON Chess Problem Database

Problem Display
PID: 182338 (k4K2/1p1N4/2n5/1N6/8/8/5nQ1/6B1 w - - 0 1)

Wainwright, Joseph CJ

American Chess Bulletin, 1906

k4K2/1p1N4/2n5/1N6/8/8/5nQ1/6B1

#2

5 + 4

6490 yacpdb 2018
3713 Snap 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Sc7#
    • 1...Sh1
      • 2.Sc7#
    • 1...Sd3
      • 2.Sc7#
    • 1...Sh3
      • 2.Sc7#
    • 1...Se4
      • 2.Sc7#
    • 1...Sg4
      • 2.Sc7#
    • 1...Sa7
      • 2.Sc7#
    • 1...Sb8
      • 2.Sb6#
    • 1...b6
      • 2.Qxc6#
  • Tries
    • 1.Bxf2?
      • threat
        • 2.Sc7#
      • 1...b6
        • 2.Qxc6#
      • 1...Sd4!
    • 1.Bh2?
      • threat
        • 2.Sb6#
      • 1...b6
        • 2.Qxc6#
      • 1...Se5!
    • 1.Qxf2?
      • threat
        • 2.Sc7#
      • 1...Sd4
        • 2.Qa2#
      • 1...b6!
    • 1.Qg3?
      • threat
        • 2.Sb6#
      • 1...Se5
        • 2.Qa3#
      • 1...b6!
    • 1.Qg8?
      • 1...Sb4
        • 2.Ke7#
        • 2.Kf7#
        • 2.Kg7#
      • 1...Sd1
        • 2.Sc7#
      • 1...Sh1
        • 2.Sc7#
      • 1...Sd3
        • 2.Sc7#
      • 1...Sh3
        • 2.Sc7#
      • 1...Se4
        • 2.Sc7#
      • 1...Sg4
        • 2.Sc7#
      • 1...Sd4
        • 2.Ke7#
        • 2.Kf7#
        • 2.Kg7#
        • 2.Qa2#
      • 1...Sa5
        • 2.Ke7#
        • 2.Kf7#
        • 2.Kg7#
      • 1...Se5
        • 2.Ke7#
        • 2.Kg7#
        • 2.Qa2#
      • 1...Sa7
        • 2.Sc7#
      • 1...Se7
        • 2.Kxe7#
        • 2.Qa2#
      • 1...Sb8
        • 2.Sb6#
      • 1...Sd8
        • 2.Qa2#
      • 1...b6!
  • Keys
    • 1.Qe4!
      • 1...Sxe4
        • 2.Sc7#
      • 1...b6
        • 2.Qxc6#
      • 1...Sb4
        • 2.Qe8#
      • 1...Sd1
        • 2.Sc7#
      • 1...Sh1
        • 2.Sc7#
      • 1...Sd3
        • 2.Sc7#
      • 1...Sh3
        • 2.Sc7#
      • 1...Sg4
        • 2.Sc7#
      • 1...Sd4
        • 2.Qe8#
      • 1...Sa5
        • 2.Qe8#
      • 1...Se5
        • 2.Qa4#
      • 1...Sa7
        • 2.Sc7#
      • 1...Se7
        • 2.Qa4#
      • 1...Sb8
        • 2.Sb6#
      • 1...Sd8
        • 2.Qa4#

This anticipates 226688(1945)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • S(a);::S(C)
    • S(b);P_SPINP(c),SBLOCK::S(C)
    • S(b);P_SPINP(c),SBLOCK::S(D)
    • P(c);OGATEB,P_SPINS(b)::QAB(B),XS(b)
  • Tries
    • Try
      • B(A);XS(a)
      • Threat
        • S(C)
      • Vars
        • P(c);OGATEB,P_SPINS(b)::QAB(B),XS(b)
      • Refutation
        • S(b);P_SPINP(c)
    • Try
      • B(A);
      • Threat
        • S(D)
      • Vars
        • P(c);OGATEB,P_SPINS(b)::QAB(B),XS(b)
      • Refutation
        • S(b);P_SPINP(c)
    • Try
      • Q(B);XS(a)
      • Threat
        • S(C)
      • Vars
        • S(b);N_GUARD::QAR(B)
      • Refutation
        • P(c);
    • Try
      • Q(B);
      • Threat
        • S(D)
      • Vars
        • S(b);N_GUARD::QAR(B)
      • Refutation
        • P(c);
    • Try
      • Q(B);
      • Vars
        • S(a);::S(C)
        • S(b);SBLOCK::S(C)
        • S(b);SBLOCK::S(D)
        • S(b);N_GUARD::QAR(B)
      • Refutation
        • P(c);
  • Actual
    • Q(B);
    • Vars
      • S(a);XQ(B)::S(C)
      • P(c);OGATEB,P_SPINS(b)::QAB(B),XS(b)
      • S(b);N_GUARD,P_SPINP(c)::QAR(B)
      • S(a);::S(C)
      • S(b);P_SPINP(c),SBLOCK::S(C)
      • S(b);P_SPINP(c),SBLOCK::S(D)
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