MESON Chess Problem Database

Problem Display
PID: 225500 (8/1BNp3K/3B3p/qP4b1/r2kp2r/1P1n3Q/8/3N4 w - - 0 1)

Hasenzahl, Karl

Praca, 1958

8/1BNp3K/3B3p/qP4b1/r2kp2r/1P1n3Q/8/3N4

#2

8 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb5
      • 2.Sxb5#
    • 1...Rf4
      • 2.Qe3#
    • 1...Be3
      • 2.Qxe3#
    • 1...Bf6
      • 2.Qe3#
    • 1...Be7
      • 2.Qe3#
    • 1...Bd8
      • 2.Qe3#
    • 1...Sb4
      • 2.Qc3#
    • 1...Sf4
      • 2.Qe3#
  • Keys
    • 1.Qe6!
      • threat
        • 2.Qd5#
      • 1...Qxb5
        • 2.Sxb5#
      • 1...dxe6
        • 2.Sxe6#
      • 1...Sb4
        • 2.Qc4#
      • 1...Sf4
        • 2.Qxe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • Q(f);XP(D)::S(G),XQ(f)
    • R(e);S_CUTB(g)::QAB1(C)
    • B(g);N_GUARD::QAB1(C),XB(g)
    • B(g);N_GUARD::QAB1(C)
    • S(a);OGATE::QAB1(C)
    • S(a);S_CUTB(g)::QAB1(C)
  • Actual
    • Q(C);
    • Threat
      • QAR1(C)
    • Vars
      • Q(f);XP(D)::S(G),XQ(f)
      • P(i);XQ(C)::S(G),XP(i)
      • S(a);S_CUTR(b)::QAR1(C)
      • S(a);S_CUTR(e)::QAR1(C),XP(d)
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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).