MESON Chess Problem Database

Problem Display
PID: 134037 (8/4p3/4p1p1/1pP1NpK1/1PPk2P1/2p1p1N1/4P3/7Q w - - 0 1)

Lawson, M

The Field, 1964

(First published on Wed Oct 29 1969)

8/4p3/4p1p1/1pP1NpK1/1PPk2P1/2p1p1N1/4P3/7Q

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe5
      • 2.Qh8#
    • 1...c2
      • 2.Qa1#
    • 1...bxc4
      • 2.Sc6#
    • 1...fxg4
      • 2.Qe4#
    • 1...f4
      • 2.Qe4#
  • Tries
    • 1.Kf4?
      • threat
        • 2.Qd1#
      • 1...c2
        • 2.Qa1#
      • 1...g5+!
    • 1.Kxg6?
      • 1...bxc4
        • 2.Sc6#
      • 1...fxg4
        • 2.Qe4#
      • 1...c2
        • 2.Qa1#
      • 1...f4
        • 2.Qe4#
      • 1...Kxe5!
    • 1.Qf3?
      • threat
        • 2.Qf4#
      • 1...Kxe5
        • 2.Qxe3#
        • 2.Qf4#
      • 1...bxc4
        • 2.Sc6#
      • 1...f4
        • 2.Qe4#
        • 2.Qxf4#
      • 1...c2!
    • 1.Qf1?
      • threat
        • 2.Qf4#
      • 1...Kxe5
        • 2.Qf4#
      • 1...c2
        • 2.Qa1#
      • 1...f4
        • 2.Qxf4#
      • 1...bxc4!
    • 1.gxf5?
      • threat
        • 2.Qe4#
      • 1...Kxe5
        • 2.Qe4#
        • 2.Qh8#
      • 1...exf5
        • 2.Qd5#
      • 1...c2
        • 2.Qa1#
      • 1...gxf5!
  • Keys
    • 1.Qa8!
      • 1...Kxe5
        • 2.Qh8#
      • 1...bxc4
        • 2.Sf3#
      • 1...fxg4
        • 2.Qe4#
      • 1...c2
        • 2.Qa1#
      • 1...f4
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(c);OGATEB,S_FLIGHT,XS(H)::QAB(A)
    • P(a);OGATEB::QAB(A)
    • P(d);SBLOCK,XP(E)::S(H)
    • P(e);N_GUARD,XP(F)::QAR1(A)
    • P(e);N_GUARD::QAR1(A)
  • Tries
    • Try
      • K(I);S_FLIGHT
      • Threat
        • QAR(A)
      • Vars
        • P(a);OGATEB::QAB(A)
      • Refutation
        • P(g);CHECK
    • Try
      • K(I);P-FLIGHT,XP(g)
      • Vars
        • P(d);SBLOCK,XP(E)::S(H)
        • P(e);N_GUARD,XP(F)::QAR1(A)
        • P(a);OGATEB::QAB(A)
        • P(e);N_GUARD::QAR1(A)
      • Refutation
        • K(c);S_FLIGHT,XS(H)
    • Try
      • Q(A);
      • Threat
        • QAR2(A)
      • Vars
        • P(d);SBLOCK,XP(E)::S(H)
      • Refutation
        • P(a);
    • Try
      • Q(A);
      • Threat
        • QAR2(A)
      • Vars
        • K(c);S_FLIGHT,XS(H)::QAB1(A)
        • P(a);OGATEB::QAB(A)
        • P(e);::QAR2(A),XP(e)
      • Refutation
        • P(d);XP(E)
    • Try
      • P(F);XP(e)
      • Threat
        • QAR1(A)
      • Vars
        • P(f);N_GUARD,XP(F)::QAR1(A)
        • P(a);OGATEB::QAB(A)
      • Refutation
        • P(g);XP(F)
  • Actual
    • Q(A);
    • Vars
      • K(c);OGATEB,S_FLIGHT,XS(H)::QAB(A)
      • P(d);SBLOCK,XP(E)::S(H)
      • P(e);N_GUARD,XP(F)::QAR1(A)
      • P(a);OGATEB::QAB(A)
      • P(e);N_GUARD::QAR1(A)
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