MESON Chess Problem Database

Problem Display
PID: 204286 (8/q2p4/3P4/5R2/Ppkpp3/1r1N2K1/BP2P3/2rn1Q1b w - - 0 1)

Lobel, Emil

Arbeiter Schachzeitung, 1925

8/q2p4/3P4/5R2/Ppkpp3/1r1N2K1/BP2P3/2rn1Q1b

#2

9 + 10

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qc5
      • 2.Rxc5#
    • 1...Qb8
      • 2.Rc5#
    • 1...Qxa4
      • 2.Rc5#
    • 1...Qa6
      • 2.Rc5#
    • 1...Qb7
      • 2.Rc5#
    • 1...Qa8
      • 2.Rc5#
    • 1...Sxb2
      • 2.Qxc1#
    • 1...Sf2
      • 2.Qxc1#
    • 1...exd3
      • 2.exd3#
  • Tries
    • 1.Ra5?
      • threat
        • 2.Qf7#
      • 1...Sxb2
        • 2.Qxc1#
      • 1...exd3
        • 2.exd3#
      • 1...Qc5
        • 2.Rxc5#
      • 1...Qb7
        • 2.Rc5#
      • 1...Qa8
        • 2.Rc5#
      • 1...Bf3
        • 2.Se5#
      • 1...Sf2
        • 2.Qxc1#
      • 1...Sc3
        • 2.Se5#
      • 1...Se3
        • 2.Se5#
      • 1...e3
        • 2.Se5#
      • 1...Qxa5!
  • Keys
    • 1.Rb5!
      • threat
        • 2.Qf7#
      • 1...Qxa4
        • 2.Rc5#
      • 1...Sxb2
        • 2.Qxc1#
      • 1...exd3
        • 2.exd3#
      • 1...Qc5
        • 2.Rxc5#
      • 1...Qb7
        • 2.Rc5#
      • 1...Qa8
        • 2.Rc5#
      • 1...Bf3
        • 2.Se5#
      • 1...Sf2
        • 2.Qxc1#
      • 1...Sc3
        • 2.Se5#
      • 1...Se3
        • 2.Se5#
      • 1...e3
        • 2.Se5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • Q(i);N_GUARD::R1(H),XQ(i)
    • Q(i);N_GUARD,P_PINP(I)::R1(H)
    • Q(i);N_GUARD,XP(G)::R1(H)
    • Q(i);N_GUARD::R1(H)
    • S(b);OGATE,XP(C)::QAR(A),XR(a)
    • S(b);OGATE::QAR(A),XR(a)
    • P(h);OGATE,XS(E)::P(D),XP(h)
  • Tries
    • Try
      • R(H);
      • Threat
        • QAB(A)
      • Vars
        • S(b);OGATE,XP(C)::QAR(A),XR(a)
        • P(h);OGATE,XS(E)::P(D),XP(h)
        • Q(i);N_GUARD::R1(H),XQ(i)
        • Q(i);N_GUARD::R1(H)
        • B(c);N_PINS(E)::S(E)
        • S(b);OGATE::QAR(A),XR(a)
        • S(b);N_PINS(E)::S(E)
        • P(h);N_PINS(E)::S(E)
      • Refutation
        • Q(i);XR(H)
  • Actual
    • R(H);
    • Threat
      • QAB(A)
    • Vars
      • Q(i);N_GUARD,XP(G)::R1(H)
      • S(b);OGATE,XP(C)::QAR(A),XR(a)
      • P(h);OGATE,XS(E)::P(D),XP(h)
      • Q(i);N_GUARD::R1(H),XQ(i)
      • Q(i);N_GUARD::R1(H)
      • B(c);N_PINS(E)::S(E)
      • S(b);OGATE::QAR(A),XR(a)
      • S(b);N_PINS(E)::S(E)
      • P(h);N_PINS(E)::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).