MESON Chess Problem Database

Problem Display
PID: 203510 (K2B4/8/1R2N1p1/4k2n/1p2p3/4Nr2/1p3P2/6RQ w - - 0 1)

Lobel, Ernst

Arbeiter Schachzeitung, 1924

K2B4/8/1R2N1p1/4k2n/1p2p3/4Nr2/1p3P2/6RQ

#2

8 + 7

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Rxe3
      • 2.Rg5#
    • 1...Rh3
      • 2.Rg5#
    • 1...Rf6
      • 2.Bc7#
    • 1...Sf4
      • 2.Rg5#
      • 2.Qh8#
    • 1...Sf6
      • 2.Bc7#
  • Tries
    • 1.Sc4+?
      • 1...Kf5
        • 2.Rg5#
      • 1...Kd5!
    • 1.Rd1?
      • threat
        • 2.Rd5#
      • 1...Sf4
        • 2.Qh8#
      • 1...Sf6
        • 2.Bc7#
      • 1...Rxe3!
    • 1.Qxf3?
      • threat
        • 2.Bc7#
        • 2.Rg5#
      • 1...Sg3
        • 2.Bf6#
        • 2.Bc7#
        • 2.Qxg3#
        • 2.Qf4#
        • 2.Qf6#
      • 1...Sf4
        • 2.Rg5#
        • 2.Qxf4#
      • 1...Sg7
        • 2.Bf6#
        • 2.Bc7#
        • 2.Qg3#
        • 2.Qf4#
        • 2.Qf6#
      • 1...g5
        • 2.Bc7#
        • 2.Rxg5#
        • 2.Qf5#
      • 1...exf3!
  • Keys
    • 1.Ra1!
      • threat
        • 2.Ra5#
      • 1...bxa1Q+
        • 2.Qxa1#
      • 1...bxa1R+
        • 2.Qxa1#
      • 1...bxa1S
        • 2.Qxa1#
      • 1...bxa1B
        • 2.Qxa1#
      • 1...Sf4
        • 2.Qh8#
      • 1...Sf6
        • 2.Bc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • R(b);N_GUARD,XS(D)::R(A)
    • R(b);N_GUARD::R(A)
    • R(b);SBLOCK::B(H)
    • S(f);SBLOCK::B(H)
  • Tries
    • Try
      • S(D);CHECK
      • Vars
        • K(e);P-FLIGHT::R1(A)
      • Refutation
        • K(e);P-FLIGHT
    • Try
      • R(A);
      • Threat
        • R1(A)
      • Vars
        • S(f);OGATE::QAB(B)
        • S(f);SBLOCK::B(H)
      • Refutation
        • R(b);XS(D)
    • Try
      • Q(B);XR(b)
      • Threat
        • DUALS(2)
      • Refutation
        • P(d);XQ(B)
  • Actual
    • R(A);
    • Threat
      • R(A)
    • Vars
      • P(a);CHECK,OGATE,XR(A)::QAB(B),XQ(a)
      • P(a);CHECK,OGATE,XR(A)::QAB(B),XR(a)
      • P(a);OGATE,XR(A)::QAB(B),XS(a)
      • P(a);OGATE,XR(A)::QAB(B),XB(a)
      • S(f);OGATE::QAB(B)
      • S(f);SBLOCK::B(H)
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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).