MESON Chess Problem Database

Problem Display
PID: 204530 (6b1/q7/n1p1p1B1/6pp/1b1k4/2R1N3/1B5Q/7K w - - 0 1)

Kalina, Vasily Emanuilovich

64 Shakhmatnoe obozrenie, 1925

6b1/q7/n1p1p1B1/6pp/1b1k4/2R1N3/1B5Q/7K

#2

6 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qc5
      • 2.Rd3#
    • 1...Ba5
      • 2.Qd6#
    • 1...Bc5
      • 2.Ra3#
      • 2.Rb3#
      • 2.Rd3#
    • 1...Bd6
      • 2.Qxd6#
    • 1...Sc5
      • 2.Rd3#
      • 2.Qd6#
    • 1...g4
      • 2.Qf4#
    • 1...c5
      • 2.Rd3#
      • 2.Qd6#
    • 1...e5
      • 2.Qd2#
  • Tries
    • 1.Rc2+?
      • 1...Kxe3
        • 2.Qg3#
        • 2.Qf2#
      • 1...Bc3!
    • 1.Qc2?
      • threat
        • 2.Rd3#
        • 2.Qe4#
      • 1...Bxc3
        • 2.Qxc3#
      • 1...Sc5
        • 2.Rd3#
      • 1...Ke5!
  • Keys
    • 1.Bc1!
      • threat
        • 2.Rc4#
      • 1...Kxc3
        • 2.Qb2#
      • 1...Bxc3
        • 2.Qd6#
      • 1...Qc5
        • 2.Rd3#
      • 1...e5
        • 2.Qd2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • Q(h);SBLOCK::B(B)+R(D),DCHECK
    • B(a);N_GUARD::QAR2(C)
    • B(a);N_GUARD::QAR2(C),XB(a)
    • P(c);N_GUARD::QAR2(C)
    • P(g);SBLOCK::QAR2(C)
  • Tries
    • Try
      • R(D);CHECK
      • Refutation
        • B(a);P_SPINB(a)
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);OGATE,P_SPINB(a),XR(D)::QAB1(C),XB(a)
        • S(e);::B(B)+R(D),DCHECK
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • B(B);
    • Threat
      • R1(D)
    • Vars
      • K(b);OGATEB,S_FLIGHT,XR(D)::QAB1(C)
      • B(a);N_GUARD,SBLOCK,XR(D)::QAR2(C)
      • Q(h);SBLOCK::R1(D)
      • P(g);SBLOCK::QAR2(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).