MESON Chess Problem Database

Problem Display
PID: 71149 (4Q3/2NK2b1/1p6/n7/N1pkPB2/2R5/8/1q2r2b w - - 0 1)

Pries, Alfred

Chess, 1951

4Q3/2NK2b1/1p6/n7/N1pkPB2/2R5/8/1q2r2b

#2

7 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qa2
      • 2.Sb5#
    • 1...Qc2
      • 2.Sb5#
    • 1...Qd3
      • 2.Sb5#
    • 1...Qa1
      • 2.Sb5#
    • 1...Qc1
      • 2.Sb5#
    • 1...Qd1
      • 2.Sb5#
    • 1...Qb5+
      • 2.Sxb5#
    • 1...Rc1
      • 2.Be3#
    • 1...Rd1
      • 2.Be3#
    • 1...Rf1
      • 2.Be3#
    • 1...Rg1
      • 2.Be3#
    • 1...Re3
      • 2.Bxe3#
    • 1...Be5
      • 2.Qxe5#
    • 1...Bh6
      • 2.Qe5#
    • 1...Bf8
      • 2.Qe5#
    • 1...Sb3
      • 2.Sb5#
  • Tries
    • 1.Qe6?
      • threat
        • 2.Qd5#
      • 1...Qb5+
        • 2.Sxb5#
      • 1...Qxe4
        • 2.Sb5#
        • 2.Qxb6#
      • 1...Bxe4!
  • Keys
    • 1.Qg6!
      • threat
        • 2.Se6#
      • 1...Qb5+
        • 2.Sxb5#
      • 1...Qxe4
        • 2.Qxb6#
      • 1...Rxe4
        • 2.Qd6#
      • 1...Bxe4
        • 2.Qxg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 15
  • Sets
    • Q(a);N_GUARD::S(E)
    • Q(a);CHECK,N_GUARD::S(E),XQ(a)
    • R(b);N_GUARD::B(D)
    • R(b);N_GUARD::B(D),XR(b)
    • B(h);N_GUARD::QAB1(G),XB(h)
    • B(h);N_GUARD::QAB1(G)
    • S(f);S_CUTQ(a)::S(E)
  • Tries
    • Try
      • Q(G);
      • Threat
        • QAR1(G)
      • Vars
        • Q(a);CHECK,N_GUARD::S(E),XQ(a)
      • Refutation
        • B(c);XP(C)
  • Actual
    • Q(G);
    • Threat
      • S(E)
    • Vars
      • Q(a);CHECK,N_GUARD::S(E),XQ(a)
      • Q(a);N_GUARD,SBLOCK,XP(C)::QAB(G),XP(g)
      • R(b);SBLOCK,XP(C)::QAR2(G)
      • B(c);SBLOCK,XP(C)::QAB(G),XB(h)
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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).