MESON Chess Problem Database

Problem Display
PID: 195858 (K7/2Rp2p1/1p2pn2/3kp2B/Q3N2N/2P5/b7/4r3 w - - 0 1)

Guida, Marco

StrateGems, 2018

K7/2Rp2p1/1p2pn2/3kp2B/Q3N2N/2P5/b7/4r3

#2

7 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Bb1
      • 2.Qc4#
    • 1...Bc4
      • 2.Qxc4#
    • 1...Sg4
      • 2.Rxd7#
    • 1...Sxh5
      • 2.Rxd7#
    • 1...Sh7
      • 2.Rxd7#
    • 1...Sg8
      • 2.Rxd7#
    • 1...b5
      • 2.Rc5#
    • 1...d6
      • 2.Qc6#
  • Tries
    • 1.Sxf6+?
      • 1...Kd6
        • 2.Qxd7#
      • 1...gxf6!
    • 1.Bf3?
      • threat
        • 2.Qb5#
        • 2.Qxa2#
      • 1...Rxe4
        • 2.Qd1#
      • 1...Sxe4
        • 2.Qxd7#
      • 1...Ra1
        • 2.Qb5#
      • 1...Re2
        • 2.Qb5#
      • 1...Bb1
        • 2.Qb3#
        • 2.Qb5#
        • 2.Qc4#
      • 1...Bb3
        • 2.Qxb3#
        • 2.Qb5#
      • 1...Bc4
        • 2.Qxc4#
      • 1...b5
        • 2.Rc5#
        • 2.Qxb5#
        • 2.Qxa2#
      • 1...Rb1!
    • 1.Qd1+?
      • 1...Kxe4
        • 2.Qf3#
      • 1...Rxd1!
  • Keys
    • 1.Sf5!
      • threat
        • 2.Se7#
      • 1...Rxe4
        • 2.Qb5#
      • 1...Sxe4
        • 2.Qxa2#
      • 1...exf5
        • 2.Bf7#
      • 1...Bc4
        • 2.Qxc4#
      • 1...Sg8
        • 2.Rxd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • B(b);N_GUARD::QAB1(B)
    • B(b);N_GUARD::QAB1(B),XB(b)
    • S(g);N_GUARD::R(F),XP(h)
    • S(g);N_GUARD,XB(E)::R(F),XP(h)
    • P(e);N_GUARD::R1(F)
    • P(h);N_GUARD::QAB1(B)
  • Tries
    • Try
      • S(C);CHECK,XS(g)
      • Vars
        • K(c);P-FLIGHT::QAR1(B),XP(h)
      • Refutation
        • P(i);XS(C)
    • Try
      • B(E);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);N_GUARD,P_SPINR(a),XS(C)::QAR(B)
        • S(g);N_GUARD,P_SPINS(g),XS(C)::QAR2(B),XP(h)
        • R(a);::QAR2(B)
        • B(b);N_GUARD::QAB1(B),XB(b)
      • Refutation
        • R(a);
    • Try
      • Q(B);CHECK
      • Vars
        • K(c);OGATEB,S_FLIGHT,XS(C)::QAB1(B)
      • Refutation
        • R(a);XQ(B)
  • Actual
    • S(D);
    • Threat
      • S(D)
    • Vars
      • R(a);SBLOCK,XS(C)::QAR2(B)
      • S(g);SBLOCK,XS(C)::QAB(B),XB(b)
      • P(f);OGATEB,XS(D)::B(E)
      • B(b);N_GUARD::QAB1(B),XB(b)
      • S(g);N_GUARD::R(F),XP(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).