MESON Chess Problem Database

Problem Display
PID: 285279 (N1b3nK/2b3Q1/2p1kP2/7p/2N1P3/8/B6q/B4R2 w - - 0 1)

Macleod, Norman Alasdair

Mat, 1985

N1b3nK/2b3Q1/2p1kP2/7p/2N1P3/8/B6q/B4R2

#2

9 + 7

5454 Near Snap 2026

SOLUTION

  • SOUND
  • Sets
    • 1...Qg1
      • 2.Sxc7#
    • 1...Qh1
      • 2.Sxc7#
    • 1...Qxa2
      • 2.Sxc7#
    • 1...Qb2
      • 2.Sxc7#
    • 1...Qc2
      • 2.Sxc7#
    • 1...Qd2
      • 2.Sxc7#
    • 1...Qe2
      • 2.Sxc7#
    • 1...Qf2
      • 2.Sxc7#
    • 1...Qg2
      • 2.Sxc7#
    • 1...Qh3
      • 2.Sxc7#
    • 1...Qh4
      • 2.Sxc7#
    • 1...Bd6
      • 2.Sd2#
    • 1...Bd7
      • 2.Qxg8#
    • 1...Sxf6
      • 2.Rxf6#
    • 1...Sh6
      • 2.Qe7#
    • 1...Se7
      • 2.Qxe7#
  • Tries
    • 1.Kxg8?
      • threat
        • 2.Qe7#
        • 2.Qf7#
      • 1...Qg1
        • 2.Sxc7#
      • 1...Qd6
        • 2.Qf7#
      • 1...Qg2
        • 2.Sxc7#
      • 1...Bd6
        • 2.Sd2#
        • 2.Qf7#
      • 1...Bd8
        • 2.Qf7#
      • 1...Qg3!
    • 1.Qg4+?
      • 1...Kf7
        • 2.Qxg8#
      • 1...hxg4+!
  • Keys
    • 1.Rd1!
      • threat
        • 2.Qxg8#
      • 1...Sxf6
        • 2.Qxf6#
      • 1...Qg3
        • 2.Se3#
      • 1...Qg1
        • 2.Sa3#
        • 2.Se3#
        • 2.Sa5#
        • 2.Se5#
        • 2.Scb6#
        • 2.Sd6#
        • 2.Sxc7#
      • 1...Qe5
        • 2.Sxe5#
      • 1...Qd6
        • 2.Sxd6#
      • 1...Qb2
        • 2.Sxc7#
      • 1...Qd2
        • 2.Sxc7#
      • 1...Qg2
        • 2.Sxc7#
      • 1...Be5
        • 2.Sb2#
      • 1...Bd6
        • 2.Sd2#
      • 1...Sh6
        • 2.Qe7#
      • 1...Se7
        • 2.Qxe7#

Anticipated by 15321(1982)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 9
  • Sets
    • Q(a);N_GUARD::S(H),XB(e)
    • Q(a);N_GUARD,XB(C)::S(H),XB(e)
    • B(e);SBLOCK::B(C)+S(D)
    • B(f);SBLOCK::QAB(G),XS(g)
    • S(g);OGATE,XP(F)::R1(B),XS(g)
    • S(g);N_GUARD::QAR1(G)
    • S(g);N_GUARD::QAR1(G),XS(g)
  • Tries
    • Try
      • K(I);P-FLIGHT,XS(g)
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);N_GUARD,P_PINQ(G)::S(H),XB(e)
        • Q(a);::QAB1(G)
        • B(e);::QAB1(G)
      • Refutation
        • Q(a);P_PINQ(G)
    • Try
      • Q(G);CHECK
      • Vars
        • K(d);N_GUARD,S_FLIGHT::QAB1(G),XS(g)
      • Refutation
        • P(b);CHECK,XQ(G)
  • Actual
    • R(B);
    • Threat
      • QAB(G),XS(g)
    • Vars
      • S(g);OGATE,XP(F)::QAR1(G),XS(g)
      • Q(a);N_GUARD::B(C)+S(D)
      • Q(a);N_GUARD::B(C)+S(D),XQ(a)
      • Q(a);N_GUARD::S(H),XB(e)
      • B(e);SBLOCK::B(C)+S(D)
      • S(g);N_GUARD::QAR1(G)
      • S(g);N_GUARD::QAR1(G),XS(g)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).