MESON Chess Problem Database

Problem Display
PID: 165473 (2K5/B2Np2b/6R1/4p2p/2B1k3/4P2p/4n3/2b2QnN w - - 0 1)

Shire, David J

The Problemist, 2017

2K5/B2Np2b/6R1/4p2p/2B1k3/4P2p/4n3/2b2QnN

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Sc3
      • 2.Sg3#
    • 1...Sg3
      • 2.Sxg3#
    • 1...Sf4
      • 2.Sg3#
    • 1...e6
      • 2.Sf6#
  • Tries
    • 1.Sf2+?
      • 1...Kf3
        • 2.Sxe5#
      • 1...Kf5!
    • 1.Bd3+?
      • 1...Kd5
        • 2.e4#
      • 1...Kxd3!
    • 1.Rg3?
      • threat
        • 2.Sc5#
      • 1...Bxe3
        • 2.Rxe3#
      • 1...Sxg3
        • 2.Sxg3#
      • 1...Sf3
        • 2.Qxf3#
      • 1...Ba3
        • 2.Qb1#
      • 1...Bf5
        • 2.Sf2#
      • 1...Sf4!
    • 1.Rg4+?
      • 1...Sf4
        • 2.Sg3#
      • 1...hxg4!
    • 1.Rg5?
      • threat
        • 2.Rxe5#
      • 1...Bf5
        • 2.Qxf5#
      • 1...Sf3
        • 2.Sf2#
      • 1...Bb2!
    • 1.Rd6?
      • threat
        • 2.Bd3#
      • 1...exd6
        • 2.Sf6#
      • 1...Sf4
        • 2.Sg3#
      • 1...Sd4!
  • Keys
    • 1.Rf6!
      • threat
        • 2.Sf2#
      • 1...Bxe3
        • 2.Qb1#
      • 1...exf6
        • 2.Sxf6#
      • 1...Sd4
        • 2.Qd3#
      • 1...Bf5
        • 2.Qxf5#
      • 1...Sf4
        • 2.Sg3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • S(c);N_GUARD::S(B)
    • S(c);N_GUARD::S(B),XS(c)
    • P(h);N_GUARD::S(G)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • K(e);S_FLIGHT::S(G),XP(f)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • B(D);CHECK
      • Vars
        • K(e);OGATE,S_FLIGHT::P(C)
      • Refutation
        • K(e);P_SPINS(c),S_FLIGHT,XB(D)
    • Try
      • R(E);
      • Threat
        • S(G)
      • Vars
        • B(a);OGATE,XP(C)::R1(E),XB(a)
        • S(c);XR(E)::S(B),XS(c)
        • S(b);N_GUARD::QAB1(A),XS(b)
        • B(a);OGATE::QAB(A)
        • B(i);P_PINS(G),SBLOCK::S(B)
      • Refutation
        • S(c);
    • Try
      • R(E);CHECK
      • Vars
        • S(c);P_SPINS(c)::S(B)
      • Refutation
        • P(g);XR(E)
    • Try
      • R(E);
      • Threat
        • R1(E),XP(f)
      • Vars
        • B(i);N_GUARD,P_PINS(G)::QAB1(A),XB(i)
        • S(b);SBLOCK::S(B)
      • Refutation
        • B(a);
    • Try
      • R(E);
      • Threat
        • B(D)
      • Vars
        • P(h);N_GUARD,XR(E)::S(G)
        • S(c);N_GUARD::S(B)
      • Refutation
        • S(c);
  • Actual
    • R(E);
    • Threat
      • S(B)
    • Vars
      • B(a);OGATE,XP(C)::QAB(A)
      • P(h);XR(E)::S(G),XP(h)
      • S(c);OGATE::QAB1(A)
      • B(i);N_GUARD,P_PINS(G)::QAB1(A),XB(i)
      • S(c);N_GUARD::S(B)
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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).