MESON Chess Problem Database

Problem Display
PID: 85704 (8/1p6/1K6/1B1kpQ2/8/1p6/1P6/8 w - - 0 1)

Speckmann, Werner

Schweizerische Schachzeitung, 1979

8/1p6/1K6/1B1kpQ2/8/1p6/1P6/8

#2

4 + 4

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Qd3#
    • 1...Kd6
      • 2.Qd7#
  • Tries
    • 1.Bf1?
      • 1...Kd4
        • 2.Qd3#
      • 1...Kd6!
    • 1.Be2?
      • 1...Kd4
        • 2.Qd3#
      • 1...Kd6!
    • 1.Bd3?
      • threat
        • 2.Qd7#
      • 1...Kd4
        • 2.Qe4#
      • 1...Kd6!
    • 1.Ba4?
      • 1...Kc4
        • 2.Qe4#
      • 1...Kd6
        • 2.Qd7#
      • 1...Kd4!
    • 1.Bc6+?
      • 1...Kc4
        • 2.Qe4#
      • 1...Kd4
        • 2.Qe4#
      • 1...Kd6
        • 2.Qd7#
        • 2.Qf6#
      • 1...bxc6!
    • 1.Bd7?
      • threat
        • 2.Qd3#
      • 1...Kc4
        • 2.Qe4#
      • 1...Kd6
        • 2.Qe6#
      • 1...Kd4!
    • 1.Be8?
      • 1...Kc4
        • 2.Qe4#
      • 1...Kd6
        • 2.Qd7#
      • 1...Kd4!
    • 1.Qg4?
      • 1...Kd6
        • 2.Qd7#
      • 1...e4!
    • 1.Qg6?
      • 1...Kd4
        • 2.Qd3#
      • 1...e4!
  • Keys
    • 1.Bc4+!
      • 1...Kxc4
        • 2.Qe4#
      • 1...Kd4
        • 2.Qd3#
      • 1...Kd6
        • 2.Qe6#

FEATURES

  • Static
    • TYPE = CHECKING_KEY
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(b);N_SPINP(c),P-FLIGHT::QAR1(C)
  • Tries
    • Try
      • B(B);
      • Vars
        • K(b);N_SPINP(c),P-FLIGHT::QAR1(C)
      • Refutation
        • K(b);N_SPINP(c),P-FLIGHT
    • Try
      • B(B);
      • Vars
        • K(b);N_SPINP(c),P-FLIGHT::QAR1(C)
      • Refutation
        • K(b);N_SPINP(c),P-FLIGHT
    • Try
      • B(B);
      • Threat
        • QAR2(C)
      • Vars
        • K(b);N_SPINP(c),P-FLIGHT::QAR1(C)
      • Refutation
        • K(b);N_SPINP(c),P-FLIGHT
    • Try
      • B(B);
      • Vars
        • K(b);N_SPINP(c),S_FLIGHT::QAR2(C)
        • K(b);N_SPINP(c),P-FLIGHT::QAR1(C)
      • Refutation
        • K(b);N_SPINP(c),P-FLIGHT
    • Try
      • B(B);CHECK
      • Vars
        • K(b);N_SPINP(c),S_FLIGHT::QAR2(C)
        • K(b);N_SPINP(c),P-FLIGHT::QAR1(C)
      • Refutation
        • P(d);XB(B)
    • Try
      • B(B);
      • Threat
        • QAR2(C)
      • Vars
        • K(b);N_SPINP(c),S_FLIGHT::QAR2(C)
        • K(b);N_SPINP(c),P-FLIGHT::QAR1(C)
      • Refutation
        • K(b);N_SPINP(c),P-FLIGHT
    • Try
      • B(B);
      • Vars
        • K(b);N_SPINP(c),S_FLIGHT::QAR2(C)
        • K(b);N_SPINP(c),P-FLIGHT::QAR1(C)
      • Refutation
        • K(b);N_SPINP(c),P-FLIGHT
    • Try
      • Q(C);N_PINP(c)
      • Vars
        • K(b);P-FLIGHT::QAR1(C)
      • Refutation
        • P(c);
    • Try
      • Q(C);N_PINP(c)
      • Vars
        • K(b);P-FLIGHT::QAR1(C)
      • Refutation
        • P(c);
  • Actual
    • B(B);CHECK
    • Vars
      • K(b);N_SPINP(c),S_FLIGHT,XB(B)::QAR2(C)
      • K(b);N_SPINP(c),P-FLIGHT::QAR1(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).