MESON Chess Problem Database

Problem Display
PID: 91324 (3N4/2p5/3p2R1/pkB5/p7/1NK2p2/4r3/2Q2B2 w - - 0 1)

Zajic, Helmut

Die Schwalbe, 1968

3N4/2p5/3p2R1/pkB5/p7/1NK2p2/4r3/2Q2B2

#2

7 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...f2
      • 2.Bxe2#
  • Tries
    • 1.Kd4?
      • threat
        • 2.Qc4#
      • 1...dxc5+
        • 2.Qxc5#
      • 1...Ka6
        • 2.Qc4#
      • 1...d5!
    • 1.Qf4?
      • threat
        • 2.Qc4#
      • 1...Ka6
        • 2.Qc4#
      • 1...d5!
  • Keys
    • 1.Kd3!
      • threat
        • 2.Qc4#
      • 1...Rd2+
        • 2.Kxd2#
      • 1...Re3+
        • 2.Kxe3#
      • 1...Ka6
        • 2.Qc4#
      • 1...Rc2
        • 2.Kxc2#
      • 1...Re4
        • 2.Kxe4#
      • 1...d5
        • 2.Sd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • P(b);N_GUARD::B(B),XR(a)
  • Tries
    • Try
      • K(D);S_FLIGHT
      • Threat
        • QAB1(A)
      • Vars
        • P(f);CHECK,OGATE,XB(E)::QAR1(A),XP(f)
        • K(e);P_SPINP(f),S_FLIGHT::QAB(A)
      • Refutation
        • P(f);
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • K(e);P_SPINP(f),S_FLIGHT::QAB(A)
      • Refutation
        • P(f);
  • Actual
    • K(D);N_PINR(a),P-FLIGHT
    • Threat
      • QAB1(A)
    • Vars
      • R(a);CHECK::B(B)+K(D),XR(a)
      • K(e);P_SPINP(f),S_FLIGHT::QAB(A)
      • R(a);::B(B)+K(D),XR(a)
      • P(f);::S(C)
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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).