MESON Chess Problem Database

Problem Display
PID: 184275 (2Kn4/3Qp3/4N1B1/2P1pbp1/4k1r1/7N/4PP2/4n3 w - - 0 1)

Holroyd, GC

The Observer, 1928

(First published on Sun Apr 22 1928)

2Kn4/3Qp3/4N1B1/2P1pbp1/4k1r1/7N/4PP2/4n3

#2

8 + 8

15239 Valois Notebooks 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rf4
      • 2.Shxg5#
      • 2.Sexg5#
    • 1...Rh4
      • 2.Shxg5#
      • 2.Sexg5#
    • 1...Sc2
      • 2.Qd3#
    • 1...Sg2
      • 2.Qd3#
    • 1...Sd3
      • 2.Qxd3#
    • 1...Sf3
      • 2.Qd3#
    • 1...Sc6
      • 2.Qxc6#
    • 1...Sb7
      • 2.Qc6#
      • 2.Qxb7#
    • 1...Sf7
      • 2.Qc6#
      • 2.Qb7#
  • Tries
    • 1.Qb7+?
      • 1...Sc6
        • 2.Qxc6#
      • 1...Sxb7!
    • 1.f3+?
      • 1...Sxf3
        • 2.Qd3#
      • 1...Ke3!
  • Keys
    • 1.Sc7!
      • threat
        • 2.Bxf5#
      • 1...Bxg6
        • 2.Qxg4#
      • 1...Rf4
        • 2.Sxg5#
      • 1...Se6
        • 2.Qd5#
      • 1...e6
        • 2.Qa4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 5
  • Sets
    • S(a);N_GUARD::QAB1(G)
    • S(a);N_GUARD::QAB1(G),XS(a)
    • S(h);N_GUARD::QAB(G),XS(h)
  • Tries
    • Try
      • Q(G);CHECK,P_SPINS(E)
      • Vars
        • S(h);N_GUARD,P_SPINS(h)::QAB(G),XS(h)
      • Refutation
        • S(h);XQ(G)
    • Try
      • P(B);CHECK
      • Vars
        • S(a);XP(B)::QAB1(G)
      • Refutation
        • K(b);N_SPINB(e),P-FLIGHT
  • Actual
    • S(E);P_SPINQ(G)
    • Threat
      • B(F),XB(e)
    • Vars
      • B(e);N_PINQ(G),N_SPINB(e),XB(F)::QAR2(G),XR(c)
      • R(c);N_GUARD,SBLOCK::S(C),XP(f)
      • S(h);N_PINQ(G)::QAB1(G)
      • P(g);N_PINQ(G)::QAR(G)
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