MESON Chess Problem Database

Problem Display
PID: 192710 (1b6/1p4p1/2p1k1N1/4NnK1/7p/3R1Qpb/8/8 w - - 0 1)

Holroyd, GC

The Observer, 1939

(First published on Sun May 28 1939)

1b6/1p4p1/2p1k1N1/4NnK1/7p/3R1Qpb/8/8

#2

5 + 9

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Bf1
      • 2.Qxf5#
    • 1...Bg2
      • 2.Qxf5#
    • 1...Se3
      • 2.Qf7#
    • 1...Se7
      • 2.Qf7#
    • 1...c5
      • 2.Qd5#
  • Tries
    • 1.Sf8+?
      • 1...Kxe5
        • 2.Qf4#
      • 1...Ke7!
    • 1.Rd8?
      • threat
        • 2.Qb3#
      • 1...Bf1
        • 2.Qxf5#
      • 1...Bg2
        • 2.Qxf5#
      • 1...Se3
        • 2.Qf7#
      • 1...Sd4
        • 2.Qf7#
      • 1...Se7
        • 2.Qf7#
      • 1...c5
        • 2.Qd5#
      • 1...Sd6!
    • 1.Qxc6+?
      • 1...Bd6
        • 2.Qd5#
        • 2.Qd7#
        • 2.Qc4#
        • 2.Qc8#
      • 1...Sd6
        • 2.Qd5#
        • 2.Qd7#
      • 1...bxc6!
  • Keys
    • 1.Rd7!
      • threat
        • 2.Qb3#
      • 1...Bxe5
        • 2.Sf8#
      • 1...Sd6
        • 2.Re7#
      • 1...Bf1
        • 2.Qxf5#
      • 1...Bg2
        • 2.Qxf5#
      • 1...Se3
        • 2.Qf7#
      • 1...Sd4
        • 2.Qf7#
      • 1...Se7
        • 2.Qf7#
      • 1...c5
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • B(b);N_GUARD::QAB1(B),XS(d)
    • S(d);OGATE::QAB1(B)
    • P(e);N_GUARD::QAB1(B)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • K(f);P-FLIGHT,XS(C)::QAB1(B)
      • Refutation
        • K(f);P-FLIGHT
    • Try
      • R(A);
      • Threat
        • QAB(B)
      • Vars
        • B(b);N_GUARD::QAB1(B),XS(d)
        • S(d);OGATE::QAB1(B)
        • P(e);N_GUARD::QAB1(B)
      • Refutation
        • S(d);
    • Try
      • Q(B);CHECK,XP(e)
      • Refutation
        • P(g);XQ(B)
  • Actual
    • R(A);
    • Threat
      • QAB(B)
    • Vars
      • B(i);SBLOCK,XS(C)::S(E)
      • S(d);N_GUARD,SBLOCK::R1(A)
      • B(b);N_GUARD::QAB1(B),XS(d)
      • S(d);OGATE::QAB1(B)
      • P(e);N_GUARD::QAB1(B)
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