MESON Chess Problem Database

Problem Display
PID: 96221 (q7/3N2R1/1Pnkp3/1B2p1N1/2PnQ1K1/b7/7p/8 w - - 0 1)

Allison, Christopher John

The Field, 1953

(First published on Thu Nov 5 1953)

q7/3N2R1/1Pnkp3/1B2p1N1/2PnQ1K1/b7/7p/8

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Bc1
      • 2.c5#
    • 1...Bb2
      • 2.c5#
    • 1...Sb4
      • 2.Qxe5#
      • 2.c5#
    • 1...Sa5
      • 2.Qxe5#
    • 1...Sa7
      • 2.Qxe5#
    • 1...Se7
      • 2.Sf7#
      • 2.Qxe5#
    • 1...Sb8
      • 2.Qxe5#
    • 1...Sd8
      • 2.Qxe5#
  • Tries
    • 1.Qxc6+?
      • 1...Sxc6
        • 2.Se4#
      • 1...Qxc6!
    • 1.Qxd4+?
      • 1...exd4
        • 2.Se4#
      • 1...Sxd4!
  • Keys
    • 1.Qf3!
      • threat
        • 2.Se4#
      • 1...Sb4
        • 2.c5#
      • 1...Sa5
        • 2.Qxa3#
      • 1...Sa7
        • 2.Qxa3#
      • 1...Se7
        • 2.Sf7#
      • 1...Sb8
        • 2.Qf8#
      • 1...Sd8
        • 2.Qf8#
      • 1...e4
        • 2.Sxe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • B(b);N_GUARD::P(A)
    • S(e);N_GUARD::QAB1(B),XP(d)
  • Tries
    • Try
      • Q(B);CHECK,XS(e)
      • Vars
        • S(c);XQ(B)::S(E)
      • Refutation
        • Q(h);XQ(B)
    • Try
      • Q(B);CHECK,XS(c)
      • Vars
        • P(d);XQ(B)::S(E)
      • Refutation
        • S(e);XQ(B)
  • Actual
    • Q(B);
    • Threat
      • S(E)
    • Vars
      • S(e);S_CUTB(b)::P(A)
      • S(e);N_GUARD,S_CUTQ(h)::QAB(B),XB(b)
      • S(e);SBLOCK::S(E)
      • S(e);N_GUARD,S_CUTQ(h)::QAB(B)
      • P(d);::S(E),XP(d)
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