MESON Chess Problem Database

Problem Display
PID: 250154 (kb1R3q/1r4p1/K1p4r/2Q5/N7/8/8/7B w - - 0 1)

van Dijk, Johannes

Der Tijd, 1927

kb1R3q/1r4p1/K1p4r/2Q5/N7/8/8/7B

#2

5 + 7

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rb1
      • 2.Qa7#
    • 1...Rb2
      • 2.Qa7#
    • 1...Rb3
      • 2.Qa7#
    • 1...Rb4
      • 2.Qa7#
    • 1...Rb5
      • 2.Qa7#
    • 1...Rb6+
      • 2.Sxb6#
    • 1...Ra7+
      • 2.Qxa7#
    • 1...Rc7
      • 2.Sb6#
    • 1...Rd7
      • 2.Sb6#
    • 1...Re7
      • 2.Sb6#
    • 1...Rf7
      • 2.Sb6#
  • Tries
    • 1.Qe7?
      • threat
        • 2.Qxb7#
      • 1...Rb6+
        • 2.Sxb6#
      • 1...Ra7+
        • 2.Qxa7#
      • 1...Rxe7
        • 2.Sb6#
      • 1...Rb1
        • 2.Qa7#
      • 1...Rb2
        • 2.Qa7#
      • 1...Rb3
        • 2.Qa7#
      • 1...Rb4
        • 2.Qa7#
      • 1...Rb5
        • 2.Qa7#
      • 1...Rc7
        • 2.Sb6#
      • 1...Rd7
        • 2.Sb6#
      • 1...c5+!
  • Keys
    • 1.Qb6!
      • threat
        • 2.Qxb7#
      • 1...Rxb6+
        • 2.Sxb6#
      • 1...Ra7+
        • 2.Qxa7#
      • 1...Rc7
        • 2.Qxb8#
      • 1...Rd7
        • 2.Qxb8#
      • 1...Re7
        • 2.Qxb8#
      • 1...Rf7
        • 2.Qxb8#
      • 1...c5
        • 2.Bxb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • R(c);N_GUARD,P_SPINP(a)::QAR1(C)
    • R(c);CHECK,N_GUARD,P_SPINP(a)::S(B),XR(c)
    • R(c);CHECK,N_GUARD,P_SPINP(a)::QAR1(C),XR(c)
    • R(c);N_GUARD,P_SPINP(a)::S(B)
  • Tries
    • Try
      • Q(C);
      • Threat
        • QAB1(C),XR(c)
      • Vars
        • R(c);CHECK,N_GUARD,P_SPINP(a)::S(B),XR(c)
        • R(c);CHECK,OGATE,P_SPINP(a)::QAR1(C),XR(c)
        • R(c);N_GUARD,P_SPINP(a),XQ(C)::S(B)
        • R(c);OGATE,P_SPINP(a)::QAR1(C)
        • R(c);N_GUARD,P_SPINP(a)::S(B)
      • Refutation
        • P(a);CHECK,P_SPINR(c)
  • Actual
    • Q(C);
    • Threat
      • QAB1(C),XR(c)
    • Vars
      • R(c);CHECK,P_SPINP(a),XQ(C)::S(B),XR(c)
      • R(c);CHECK,N_GUARD,P_SPINP(a)::QAR1(C),XR(c)
      • R(c);OGATE,P_SPINP(a)::QAR1(C),XB(f)
      • P(a);OGATE,P_PINQ(C),P_SPINR(c)::B(A),XR(c)
HTML5 logo

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).