MESON Chess Problem Database

Problem Display
PID: 193785 (K1knN3/PrB2R1r/Q1N5/7n/8/b6b/8/8 w - - 0 1)

White, Alain Campbell

Wilson, Francis Vaux

American Chess Bulletin, 1916

K1knN3/PrB2R1r/Q1N5/7n/8/b6b/8/8

#2

7 + 7

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Bc1
      • 2.Sd6#
    • 1...Bb2
      • 2.Sd6#
    • 1...Bd6
      • 2.Sxd6#
    • 1...Sxc6
      • 2.Qxb7#
    • 1...Se6
      • 2.Qxb7#
  • Keys
    • 1.Qd3!
      • threat
        • 2.Qxd8#
      • 1...Rxa7+
        • 2.Sxa7#
      • 1...Rb8+
        • 2.axb8Q#
        • 2.axb8R#
      • 1...Sxc6
        • 2.Qxh3#
      • 1...Sxf7
        • 2.Qxh3#
      • 1...Bd6
        • 2.Sxd6#
      • 1...Be7
        • 2.Sxe7#
      • 1...Bd7
        • 2.Qxd7#
      • 1...Se6
        • 2.Qd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • B(a);N_GUARD::S(G)
    • B(a);N_GUARD::S(G),XB(a)
    • S(g);N_GUARD,XS(B)::QAB1(A),XR(d)
    • S(g);N_GUARD::QAB1(A),XR(d)
  • Actual
    • Q(A);N_PINR(d)
    • Threat
      • QAR1(A),XS(g)
    • Vars
      • R(d);CHECK,XP(C)::S(B),XR(d)
      • R(d);CHECK,OGATE::PXR(d)=Q
      • S(g);N_GUARD,XS(B)::QAB(A),XB(b)
      • S(g);N_GUARD,XR(E)::QAB(A),XB(b)
      • B(a);N_GUARD::S(G),XB(a)
      • B(a);N_GUARD::S(B),XB(a)
      • B(b);N_GUARD::QAB1(A),XB(b)
      • S(g);S_CUTB(b)::QAB1(A)
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