MESON Chess Problem Database

Problem Display
PID: 471 (8/8/1P2r3/1N2p3/QPk1K3/P2N3R/b3P3/b2B4 w - - 0 1)

Maclay, J Neil

The Observer, 1956

8/8/1P2r3/1N2p3/QPk1K3/P2N3R/b3P3/b2B4

#2

10 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Bb2
      • 2.Sxb2#
    • 1...Bb1
      • 2.Bb3#
    • 1...Bb3
      • 2.Bxb3#
  • Tries
    • 1.Sd6+?
      • 1...Kc3
        • 2.Qc2#
      • 1...Rxd6!
  • Keys
    • 1.Sc3!
      • 1...Kxc3
        • 2.Qc2#
      • 1...Rxb6
        • 2.Sxe5#
      • 1...Bxc3
        • 2.Qa6#
      • 1...Rc6
        • 2.Sxe5#
        • 2.Qxc6#
      • 1...Rd6
        • 2.Sxe5#
      • 1...Rf6
        • 2.Sxe5#
      • 1...Rg6
        • 2.Sxe5#
      • 1...Rh6
        • 2.Sxe5#
      • 1...Re7
        • 2.Qc6#
      • 1...Re8
        • 2.Qc6#
      • 1...Bb2
        • 2.Sxb2#
      • 1...Bb1
        • 2.Qb3#
      • 1...Bb3
        • 2.Qxb3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 9
    • REMOVED MATES = 0
  • Sets
    • B(a);N_GUARD::S(D),XB(a)
    • B(b);N_GUARD,P_PINS(D)::B(A)
    • B(b);N_GUARD::B(A),XB(b)
  • Tries
    • Try
      • S(I);CHECK
      • Vars
        • K(c);P-FLIGHT::QAR1(F)
      • Refutation
        • R(e);XS(I)
  • Actual
    • S(I);
    • Vars
      • K(c);OGATEB,P-FLIGHT,XS(I)::QAR1(F)
      • R(e);N_GUARD,XP(J)::S(D),XP(d)
      • B(a);SBLOCK,XS(I)::QAB(F)
      • R(e);N_GUARD::S(D),XP(d)
      • R(e);N_GUARD::QAR2(F)
      • B(a);N_GUARD::S(D),XB(a)
      • B(b);N_GUARD,P_PINS(D)::QAB1(F)
      • B(b);N_GUARD::QAB1(F),XB(b)
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Developed and maintained by Brian Stephenson.
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