MESON Chess Problem Database

Problem Display
PID: 136611 (8/6n1/2p3K1/2B1k3/4pN2/7P/4Q1N1/b7 w - - 0 1)

Langstaff, William A

The Field, 1920

(First published on Sat May 29 1920)

8/6n1/2p3K1/2B1k3/4pN2/7P/4Q1N1/b7

#2

6 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Bb2
      • 2.Qxb2#
    • 1...Sh5
      • 2.Qxh5#
    • 1...Se8
      • 2.Qh5#
    • 1...e3
      • 2.Qxe3#
  • Tries
    • 1.Sd3+?
      • 1...Kd5
        • 2.Qa2#
      • 1...Ke6!
    • 1.Qc4?
      • 1...Bc3
        • 2.Qxc3#
      • 1...Bd4
        • 2.Qxd4#
      • 1...Sf5
        • 2.Qe6#
      • 1...Sh5
        • 2.Qe6#
      • 1...Se6
        • 2.Qxe6#
      • 1...Se8
        • 2.Qe6#
      • 1...e3
        • 2.Sd3#
      • 1...Bb2!
    • 1.Qh5+?
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sxh5!
  • Keys
    • 1.Se1!
      • threat
        • 2.Sed3#
      • 1...Kxf4
        • 2.Qh2#
      • 1...e3
        • 2.Qxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • B(a);N_GUARD::QAB(A),XB(a)
    • S(e);N_GUARD::QAR(A),XS(e)
    • S(e);N_GUARD::QAR(A)
    • P(b);OGATEB::QAR2(A),XP(b)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(c);N_SPINP(b),P-FLIGHT::QAB(A)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(A);N_PINP(b)
      • Vars
        • B(a);N_GUARD::QAB(A),XB(a)
        • B(a);N_GUARD::QAB1(A),XB(a)
        • S(e);N_GUARD::QAR1(A)
        • S(e);N_GUARD::QAR1(A),XS(e)
        • P(b);N_GUARD::S(D)
      • Refutation
        • B(a);
    • Try
      • Q(A);CHECK,N_PINP(b)
      • Vars
        • S(e);N_GUARD,P_SPINS(e)::QAR1(A),XS(e)
      • Refutation
        • S(e);XQ(A)
  • Actual
    • S(B);
    • Threat
      • S(B)
    • Vars
      • K(c);N_SPINP(b),OGATEB,S_FLIGHT,XS(D)::QAB(A)
      • P(b);OGATEB::QAR2(A),XP(b)
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