MESON Chess Problem Database

Problem Display
PID: 250133 (8/5R2/B7/B7/Q5b1/3q4/1pPNR3/1K1kN3 w - - 0 1)

Ellerman, Arnoldo

Hartong, Jan

Tijdschrift vd NSB, 1927

8/5R2/B7/B7/Q5b1/3q4/1pPNR3/1K1kN3

#2

9 + 4

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc2+
      • 2.Qxc2#
    • 1...Qe3
      • 2.c3#
    • 1...Qf3
      • 2.c3#
    • 1...Qg3
      • 2.c3#
    • 1...Qh3
      • 2.c3#
    • 1...Qd6
      • 2.c3#
    • 1...Qd8
      • 2.c3#
  • Tries
    • 1.Sxd3?
      • threat
        • 2.Sxb2#
        • 2.Sf2#
        • 2.Re1#
      • 1...Bxe2
        • 2.c4#
      • 1...Kxe2!
  • Keys
    • 1.Sg2!
      • threat
        • 2.Re1#
      • 1...Qxc2+
        • 2.Qxc2#
      • 1...Kxe2
        • 2.Qxg4#
      • 1...Qxe2
        • 2.c4#
      • 1...Qxd2
        • 2.Rxd2#
      • 1...Bxe2
        • 2.cxd3#
      • 1...Qe4
        • 2.Rf1#
      • 1...Qc3
        • 2.Rf1#
      • 1...Qe3
        • 2.Sxe3#
        • 2.Rf1#
        • 2.c3#
      • 1...Qg3
        • 2.c3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 5
  • Sets
    • Q(c);CHECK,OGATE,P_SPINQ(c),XP(C)::QAB1(F),XQ(c)
    • Q(c);N_PINP(C)::QAB(F)+P(C)
  • Tries
    • Try
      • S(B);N_SPINP(C),XQ(c)
      • Threat
        • DUALS(3)
      • Vars
        • B(d);SBLOCK,XR(E)::QAB(F)+P(C)
      • Refutation
        • K(a);S_FLIGHT,XR(E)
  • Actual
    • S(B);
    • Threat
      • R1(E)
    • Vars
      • Q(c);CHECK,OGATE,P_SPINQ(c),XP(C)::QAB1(F),XQ(c)
      • K(a);OGATEB,P_SPINQ(c),S_FLIGHT,XR(E)::QAB(F),XB(d)
      • Q(c);N_PINP(C),SBLOCK,XR(E)::QAB(F)+P(C)
      • Q(c);N_PINP(C),OGATE,XS(D)::R1(E),XQ(c)
      • B(d);SBLOCK,XR(E)::QAB(F)+P(C),XQ(c)
      • Q(c);::R(I)
      • Q(c);N_PINP(C)::R(I)
      • Q(c);N_PINP(C)::QAB(F)+P(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).