MESON Chess Problem Database

Problem Display
PID: 196787 (3R1r2/1r3n1Q/3B4/Pp1k2b1/1K4B1/2PN4/1N3p2/3R1q1b w - - 0 1)

Karstedt, Max AKS

11th HM., Otto Fuss Ty., 1919

3R1r2/1r3n1Q/3B4/Pp1k2b1/1K4B1/2PN4/1N3p2/3R1q1b

#2

10 + 9

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd3
      • 2.Qxh1#
    • 1...Sxd6
      • 2.Qxb7#
    • 1...Sh6
      • 2.Qxb7#
    • 1...Sh8
      • 2.Qxb7#
  • Tries
    • 1.Kb3?
      • threat
        • 2.Sb4#
      • 1...Kc6
        • 2.Sb4#
      • 1...Qxd3
        • 2.Qxh1#
      • 1...Sxd6
        • 2.Qxb7#
      • 1...b4
        • 2.Sxb4#
      • 1...Qxd1+!
    • 1.Qf5+?
      • 1...Kc6
        • 2.Qc5#
      • 1...Se5!
    • 1.Qxh1+?
      • 1...Qg2
        • 2.Qxg2#
      • 1...Qxh1!
  • Keys
    • 1.Ka3!
      • threat
        • 2.Sb4#
      • 1...b4+
        • 2.Sxb4#
      • 1...Kc6
        • 2.Sb4#
      • 1...Qxd3
        • 2.Qxh1#
      • 1...Sxd6
        • 2.Qxb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 2
  • Sets
    • Q(a);N_GUARD,P_SPINQ(a),XS(D)::QAB(I),XB(b)
    • S(h);OGATE,P_SPINS(h),XB(H)::QAB(I),XR(g)
    • S(h);OGATE::QAB(I),XR(g)
  • Tries
    • Try
      • K(E);P-FLIGHT
      • Threat
        • R(A)+S(D),DCHECK
      • Vars
        • K(e);S_FLIGHT::S(D)
        • Q(a);N_GUARD,P_PINP(C),P_SPINQ(a),XS(D)::QAB(I),XB(b)
        • S(h);OGATE,P_SPINS(h),XB(H)::QAB(I),XR(g)
        • P(d);::R(A)+S(D),DCHECK,XP(d)
      • Refutation
        • Q(a);CHECK,XR(A)
    • Try
      • Q(I);CHECK
      • Vars
        • K(e);OGATE,S_FLIGHT::QAR1(I)
      • Refutation
        • S(h);P_SPINS(h)
    • Try
      • Q(I);CHECK,XB(b)
      • Vars
        • Q(a);N_GUARD,P_SPINQ(a)::QAB(I),XQ(a)
      • Refutation
        • Q(a);XQ(I)
  • Actual
    • K(E);S_FLIGHT
    • Threat
      • R(A)+S(D),DCHECK
    • Vars
      • P(d);CHECK::R(A)+S(D),DCHECK,XP(d)
      • K(e);S_FLIGHT::S(D)
      • Q(a);N_GUARD,P_PINP(C),P_SPINQ(a),XS(D)::QAB(I),XB(b)
      • S(h);OGATE,P_SPINS(h),XB(H)::QAB(I),XR(g)
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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).