MESON Chess Problem Database

Problem Display
PID: 569 (2NnN3/r1p1p1r1/p5p1/3k4/BP1b4/3P4/K3Q1bB/8 w - - 0 1)

Lertoria, Ernest

The Observer, 1965

2NnN3/r1p1p1r1/p5p1/3k4/BP1b4/3P4/K3Q1bB/8

#2

8 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Ra8
      • 2.Sxc7#
    • 1...Rg8
      • 2.Sxe7#
    • 1...Bf1
      • 2.Qe4#
    • 1...Bh3
      • 2.Qe4#
    • 1...Be4
      • 2.Qxe4#
    • 1...Bg1
      • 2.Qe5#
    • 1...Bf2
      • 2.Qe5#
    • 1...Bc5
      • 2.Qe5#
    • 1...Be5
      • 2.Qxe5#
    • 1...Bb6
      • 2.Qe5#
    • 1...Sc6
      • 2.Bb3#
    • 1...Se6
      • 2.Qxg2#
    • 1...Sb7
      • 2.Sxc7#
    • 1...Sf7
      • 2.Sxe7#
    • 1...c5
      • 2.Sb6#
    • 1...c6
      • 2.Bb3#
    • 1...e6
      • 2.Qxg2#
  • Tries
    • 1.Sb6+?
      • 1...Bxb6
        • 2.Qe5#
      • 1...cxb6!
  • Keys
    • 1.Qg4!
      • threat
        • 2.Qd7#
      • 1...Bh3
        • 2.Qe4#
      • 1...Bc5
        • 2.Qc4#
      • 1...Be5
        • 2.Qc4#
      • 1...Se6
        • 2.Qxg2#
      • 1...Sb7
        • 2.Sxc7#
      • 1...Sf7
        • 2.Sxe7#
      • 1...c5
        • 2.Sb6#
      • 1...c6
        • 2.Bb3#
      • 1...e5
        • 2.Sf6#
      • 1...e6
        • 2.Qxg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 8
  • Sets
    • R(f);N_GUARD::S(H),XP(g)
    • R(i);N_GUARD::S(G),XP(h)
    • B(a);N_GUARD::QAB1(B)
    • B(a);N_GUARD::QAB1(B),XB(a)
    • B(b);N_GUARD::QAR1(B)
    • B(b);N_GUARD::QAR1(B),XB(b)
    • S(j);SBLOCK::B(E)
    • S(j);SBLOCK::QAB(B),XB(a)
    • S(j);S_CUTR(f)::S(H),XP(g)
    • S(j);S_CUTR(i)::S(G),XP(h)
    • P(g);N_GUARD,S_CUTB(b)::S(G)
    • P(g);SBLOCK::B(E)
    • P(h);SBLOCK::QAB(B),XB(a)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • B(b);XS(G)::QAR1(B)
      • Refutation
        • P(g);XS(G)
  • Actual
    • Q(B);
    • Threat
      • QAR2(B)
    • Vars
      • B(a);N_GUARD::QAB1(B)
      • B(b);OGATE::QAB1(B)
      • S(j);SBLOCK::QAB(B),XB(a)
      • S(j);S_CUTR(f)::S(H),XP(g)
      • S(j);S_CUTR(i)::S(G),XP(h)
      • P(g);N_GUARD,S_CUTB(b)::S(G)
      • P(g);SBLOCK::B(E)
      • P(h);N_GUARD,S_CUTB(b)::S(H)
      • P(h);SBLOCK::QAB(B),XB(a)
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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).