MESON Chess Problem Database

Problem Display
PID: 222629 (8/2K1R3/B1p2p2/p2k4/2pP4/2P1bp2/P3PN2/Q7 w - - 0 1)

McArthur, William Johnstone

English Mechanic and World of Science, 1883

(First published on Fri Jan 26 1883)

8/2K1R3/B1p2p2/p2k4/2pP4/2P1bp2/P3PN2/Q7

#2

9 + 7

6490 yacpdb 2020
15239 Valois Notebooks 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Bc1
      • 2.e4#
    • 1...Bd2
      • 2.e4#
    • 1...Bxf2
      • 2.e4#
    • 1...Bg5
      • 2.e4#
    • 1...Bh6
      • 2.e4#
    • 1...fxe2
      • 2.Qh1#
    • 1...c5
      • 2.Bb7#
    • 1...f5
      • 2.Re5#
  • Tries
    • 1.Rxe3?
      • 1...fxe2
        • 2.Qh1#
      • 1...c5
        • 2.Bb7#
      • 1...f5
        • 2.Re5#
      • 1...a4!
  • Keys
    • 1.Sd3!
      • 1...Bf4+
        • 2.Sxf4#
      • 1...Bxd4
        • 2.e4#
      • 1...fxe2
        • 2.Qh1#
      • 1...cxd3
        • 2.c4#
      • 1...Bc1
        • 2.e4#
      • 1...Bg1
        • 2.Sf4#
        • 2.e4#
      • 1...Bd2
        • 2.e4#
      • 1...Bf2
        • 2.Sf4#
        • 2.e4#
      • 1...Bg5
        • 2.e4#
      • 1...Bh6
        • 2.e4#
      • 1...f2
        • 2.Qh1#
      • 1...a4
        • 2.Sb4#
      • 1...c5
        • 2.Bb7#
      • 1...f5
        • 2.Re5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • B(a);OGATE::P(C)
    • B(a);OGATE,XS(D)::P(C)
    • P(b);OGATEB,XP(C)::QAB(A)
    • P(f);OGATEB::B(G)
    • P(g);N_GUARD::R1(I)
  • Tries
    • Try
      • R(I);XB(a)
      • Vars
        • P(b);OGATEB,XP(C)::QAB(A)
        • P(f);OGATEB::B(G)
        • P(g);N_GUARD::R1(I)
      • Refutation
        • P(d);
  • Actual
    • S(D);
    • Vars
      • B(a);CHECK,N_GUARD::S(D),XB(a)
      • B(a);OGATE,XP(F)::P(C)
      • P(b);OGATEB,XP(C)::QAB(A)
      • P(c);OGATE,XS(D)::P(E)
      • B(a);OGATE::P(C)
      • P(b);OGATEB::QAB(A)
      • P(d);N_GUARD::S(D)
      • P(f);OGATEB::B(G)
      • P(g);N_GUARD::R1(I)
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