MESON Chess Problem Database

Problem Display
PID: 250116 (b1BB4/q5N1/2pp2pn/4Pr2/3N2kp/2Q1K3/6PP/7n w - - 0 1)

Ellerman, Arnoldo

Shakhmaty, 1927

b1BB4/q5N1/2pp2pn/4Pr2/3N2kp/2Q1K3/6PP/7n

#2

9 + 10

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd4+
      • 2.Qxd4#
    • 1...Sg3
      • 2.h3#
  • Keys
    • 1.Qc4!
      • threat
        • 2.Qe2#
      • 1...Qxd4+
        • 2.Qxd4#
      • 1...Qa3+
        • 2.Sb3#
      • 1...Qe7
        • 2.Sf3#
      • 1...Qa2
        • 2.Sb3#
      • 1...Qa6
        • 2.Sb5#
      • 1...Qd7
        • 2.Sdxf5#
      • 1...Sg3
        • 2.h3#
      • 1...c5
        • 2.Sc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • Q(i);CHECK,OGATE,XS(E)::QAR(C),XQ(i)
    • S(a);SBLOCK::P(B)
  • Actual
    • Q(C);
    • Threat
      • QAB(C)
    • Vars
      • Q(i);CHECK,OGATE,P_SPINQ(i),XS(E)::QAR(C),XQ(i)
      • Q(i);CHECK,N_PINS(E)::QAR(C)+S(E)
      • Q(i);N_PINS(E),P_PINP(F)::QAR(C)+S(E)
      • Q(i);N_PINS(E)::QAR(C)+S(E)
      • Q(i);N_PINS(E),N_SPINR(d)::QAR(C)+S(E),XR(d)
      • S(a);SBLOCK::P(B)
      • P(e);N_PINS(E)::QAR(C)+S(E)
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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).