MESON Chess Problem Database

Problem Display
PID: 270801 (3B3b/1K6/4p3/2PBkpR1/4P3/7N/8/5nQ1 w - - 0 1)

McIntyre, Donald Glenoe

The Observer, 1959

(First published on Sun Oct 11 1959)

3B3b/1K6/4p3/2PBkpR1/4P3/7N/8/5nQ1

#2

8 + 5

17397 Ling Notebooks 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Bf6
      • 2.Bc7#
    • 1...Sd2
      • 2.Qa1#
    • 1...Sh2
      • 2.Qa1#
    • 1...Se3
      • 2.Qa1#
    • 1...Sg3
      • 2.Qa1#
  • Tries
    • 1.Bc6?
      • 1...Se3
        • 2.Qa1#
      • 1...Bf6
        • 2.Bc7#
      • 1...Sd2
        • 2.Qa1#
      • 1...Sh2
        • 2.Qa1#
      • 1...Sg3
        • 2.Qa1#
      • 1...Bg7!
    • 1.Rh5?
      • 1...Se3
        • 2.Qa1#
      • 1...Bg7
        • 2.Qxg7#
      • 1...Bf6
        • 2.Bc7#
      • 1...Sd2
        • 2.Qa1#
      • 1...Sh2
        • 2.Qa1#
      • 1...Sg3
        • 2.Qa1#
      • 1...exd5!
    • 1.Rg6?
      • threat
        • 2.Bc7#
        • 2.Rxe6#
      • 1...fxe4
        • 2.Rg5#
      • 1...Se3
        • 2.Qa1#
      • 1...Bf6
        • 2.Bxf6#
        • 2.Bc7#
      • 1...exd5!
    • 1.Rg7?
      • 1...Bxg7
        • 2.Qxg7#
      • 1...fxe4
        • 2.Rg5#
      • 1...Se3
        • 2.Qa1#
      • 1...Sd2
        • 2.Qa1#
      • 1...Sh2
        • 2.Qa1#
      • 1...Sg3
        • 2.Qa1#
      • 1...f4
        • 2.Rg5#
      • 1...exd5!
  • Keys
    • 1.Rg8!
      • 1...fxe4
        • 2.Rg5#
      • 1...exd5
        • 2.Re8#
      • 1...Se3
        • 2.Qa1#
      • 1...Bg7
        • 2.Qxg7#
      • 1...Bf6
        • 2.Bc7#
      • 1...Sd2
        • 2.Qa1#
      • 1...Sh2
        • 2.Qa1#
      • 1...Sg3
        • 2.Qa1#
      • 1...f4
        • 2.Rg5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • B(e);SBLOCK::B(H)
    • S(a);OGATE::QAB(A)
  • Tries
    • Try
      • B(E);
      • Vars
        • S(a);OGATE::QAB(A)
        • B(e);SBLOCK::B(H)
      • Refutation
        • B(e);
    • Try
      • R(F);
      • Vars
        • S(a);OGATE::QAB(A)
        • B(e);N_GUARD::QAB(A),XB(e)
        • B(e);SBLOCK::B(H)
      • Refutation
        • P(d);XB(E)
    • Try
      • R(F);N_PINP(c)
      • Threat
        • DUALS(2)
      • Vars
        • P(c);OGATEB,XP(C)::R(F)
        • S(a);OGATE::QAB(A)
      • Refutation
        • P(d);XB(E)
    • Try
      • R(F);N_PINP(c)
      • Vars
        • B(e);OGATE,XR(F)::QAB(A),XB(e)
        • P(c);OGATEB,XP(C)::R(F)
        • S(a);OGATE::QAB(A)
        • P(c);OGATEB::R(F)
      • Refutation
        • P(d);XB(E)
  • Actual
    • R(F);N_PINP(c)
    • Vars
      • P(c);OGATEB,XP(C)::R(F)
      • P(d);OGATEB,XB(E)::R(F)
      • S(a);OGATE::QAB(A)
      • B(e);N_GUARD::QAB(A),XB(e)
      • B(e);SBLOCK::B(H)
      • P(c);OGATEB::R(F)
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