MESON Chess Problem Database

Problem Display
PID: 154341 (3B4/3b4/r2N2r1/5p1R/4P3/q5kP/QP2PR2/5K2 w - - 0 1)

McWilliam, Robert C

Vancouver Province, 1957

(First published on Sat Oct 12 1957)

3B4/3b4/r2N2r1/5p1R/4P3/q5kP/QP2PR2/5K2

#2

10 + 6

15393 McWilliam Scrapbook 2015

SOLUTION

  • SOUND
  • Sets
    • 1...Qb3
      • 2.Qxb3#
    • 1...Re6
      • 2.Sxf5#
    • 1...Rg8
      • 2.Qxg8#
    • 1...Ba4
      • 2.Sxf5#
    • 1...Bb5
      • 2.Sxf5#
    • 1...Bc6
      • 2.Sxf5#
    • 1...Be8
      • 2.Sxf5#
    • 1...fxe4
      • 2.Sxe4#
    • 1...f4
      • 2.Rg2#
  • Keys
    • 1.Bc7!
      • threat
        • 2.Sxf5#
      • 1...Qxd6
        • 2.Qb3#
      • 1...Raxd6
        • 2.Qxa3#
      • 1...Rgxd6
        • 2.Qg8#
      • 1...fxe4
        • 2.Sxe4#
        • 2.Sf5#
      • 1...f4
        • 2.Rg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • Q(a);N_GUARD::QAR(B),XQ(a)
    • R(e);S_CUTB(f)::S(I),XP(c)
    • R(e);OGATEB::QAR(B),XR(e)
    • B(f);N_GUARD::S(I),XP(c)
    • B(f);N_GUARD,P_PINP(D)::S(I),XP(c)
    • P(c);XP(G)::S(I),XP(c)
    • P(c);SBLOCK::R1(E)
  • Actual
    • B(J);
    • Threat
      • B(J)+S(I),DCHECK,XP(c)
    • Vars
      • Q(a);N_GUARD,P_SPINQ(a),XS(I)::QAR(B)
      • R(d);N_GUARD,P_SPINR(d),XS(I)::QAR(B),XQ(a)
      • R(e);OGATEB,P_SPINR(e),XS(I)::QAR(B)
      • P(c);SBLOCK::R1(E)
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