MESON Chess Problem Database

Problem Display
PID: 224471 (2R3B1/3p3P/2n1b1p1/3k4/Kp1P4/b2Q4/1p1nN2B/8 w - - 0 1)

Stal, Karl Alfred

Philadelphia Times, 1887

2R3B1/3p3P/2n1b1p1/3k4/Kp1P4/b2Q4/1p1nN2B/8

#2

8 + 9

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Bf7
      • 2.Bxf7#
    • 1...Bxg8
      • 2.hxg8Q#
      • 2.hxg8B#
    • 1...Sc4
      • 2.Qf3#
    • 1...Se4
      • 2.Qb3#
    • 1...Sxd4
      • 2.Qxd4#
    • 1...Sa5
      • 2.Rc5#
    • 1...Se5
      • 2.dxe5#
    • 1...Sa7
      • 2.Rc5#
    • 1...Se7
      • 2.Rc5#
    • 1...Sb8
      • 2.Rc5#
    • 1...Sd8
      • 2.Rc5#
    • 1...b3
      • 2.Sc3#
    • 1...d6
      • 2.Sf4#
  • Tries
    • 1.Qf5+?
      • 1...Kc4
        • 2.Qb5#
      • 1...Se5
        • 2.Qxe5#
      • 1...gxf5!
  • Keys
    • 1.Rc7!
      • threat
        • 2.Rxd7#
      • 1...Bxg8
        • 2.hxg8Q#
        • 2.hxg8B#
      • 1...Sxd4
        • 2.Qxd4#
      • 1...Bf7
        • 2.Bxf7#
      • 1...Se5
        • 2.dxe5#
      • 1...Sc4
        • 2.Qf3#
      • 1...Se4
        • 2.Qb3#
      • 1...Sa5
        • 2.Rc5#
      • 1...Sa7
        • 2.Rc5#
      • 1...Se7
        • 2.Rc5#
      • 1...Sb8
        • 2.Rc5#
      • 1...Sd8
        • 2.Rc5#
      • 1...b3
        • 2.Sc3#
      • 1...d6
        • 2.Sf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • B(g);OGATEB::B(H),XB(g)
    • B(g);N_SPINB(g),OGATE,XB(H)::PXB(g)=Q
    • S(b);N_GUARD,SBLOCK::QAB(C)
    • S(f);OGATE,P_SPINS(f),XP(E)::QAR1(C),XS(f)
    • S(f);OGATE::R1(G)
    • S(f);OGATE::QAR(C)+P(E),XS(f)
    • P(d);N_GUARD::S(A)
    • P(i);SBLOCK::S(A)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(e);OGATE,P_SPINS(f),S_FLIGHT::QAB1(C)
        • S(f);N_GUARD,P_SPINS(f)::QAR1(C),XS(f)
      • Refutation
        • P(h);XQ(C)
  • Actual
    • R(G);
    • Threat
      • R(G),XP(i)
    • Vars
      • B(g);N_SPINB(g),OGATE,XB(H)::PXB(g)=Q
      • S(f);OGATE,P_SPINS(f),XP(E)::QAR1(C),XS(f)
      • B(g);OGATEB::B(H),XB(g)
      • S(f);OGATE::QAR(C)+P(E),XS(f)
      • S(b);N_GUARD,SBLOCK::QAB(C)
      • S(f);OGATE::R1(G)
      • P(d);N_GUARD::S(A)
      • P(i);SBLOCK::S(A)
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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).