MESON Chess Problem Database

Problem Display
PID: 218019 (3N1B2/6Q1/2pP1p2/4k2b/qpP2N1n/3B2P1/2P3n1/b6K w - - 0 1)

Marshall, Burney Means

British Chess Magazine, 1920

3N1B2/6Q1/2pP1p2/4k2b/qpP2N1n/3B2P1/2P3n1/b6K

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc2
      • 2.Sxc6#
    • 1...Qb3
      • 2.Sxc6#
    • 1...Qa2
      • 2.Sxc6#
    • 1...Qa3
      • 2.Sxc6#
    • 1...Qa5
      • 2.Sxc6#
    • 1...Qa7
      • 2.Sxc6#
    • 1...Bd4
      • 2.Qe7#
  • Keys
    • 1.Qa7!
      • threat
        • 2.Qc5#
      • 1...Qxa7
        • 2.Sxc6#
      • 1...Sxf4
        • 2.Qe3#
      • 1...c5
        • 2.Qxc5#
      • 1...f5
        • 2.Qg7#
      • 1...Qb5
        • 2.Qxa1#
      • 1...Qa5
        • 2.Sxc6#
      • 1...Bd4
        • 2.Qe7#
      • 1...Bf3
        • 2.Sf7#
      • 1...Bf7
        • 2.Sxf7#
      • 1...Se3
        • 2.Qxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 4
  • Sets
    • Q(c);N_GUARD,XP(B)::S(I),XP(h)
    • Q(c);N_GUARD::S(I),XP(h)
    • B(a);SBLOCK::QAR2(H)
  • Actual
    • Q(H);N_PINP(i)
    • Threat
      • QAR2(H)
    • Vars
      • Q(c);N_GUARD,XQ(H)::S(I),XP(h)
      • S(b);N_GUARD,XS(F)::QAR2(H)
      • P(h);::QAR2(H),XP(h)
      • P(i);OGATEB::QAB(H)
      • Q(c);OGATE::QAB(H),XB(a)
      • Q(c);N_GUARD::S(I),XP(h)
      • B(a);SBLOCK::QAR2(H)
      • B(g);N_GUARD::S(I)
      • B(g);N_GUARD::S(I),XB(g)
      • S(b);N_GUARD::QAR2(H),XS(b)
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Developed and maintained by Brian Stephenson.
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