MESON Chess Problem Database

Problem Display
PID: 201446 (5R2/1b4r1/B3N3/2p1n1BQ/4k3/p1r4q/3RP3/KN6 w - - 0 1)

Malpas, Louis

L'Alfiere di Re, 1922

5R2/1b4r1/B3N3/2p1n1BQ/4k3/p1r4q/3RP3/KN6

#2

9 + 8

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qg2
      • 2.Sxc3#
    • 1...Qg4
      • 2.Sxc3#
    • 1...Qf5
      • 2.Sxc3#
    • 1...Qxe6
      • 2.Sxc3#
    • 1...Qh2
      • 2.Sxc3#
    • 1...Qh4
      • 2.Sxc3#
    • 1...Qxh5
      • 2.Sxc3#
    • 1...Rb3
      • 2.Sxc5#
    • 1...Re3
      • 2.Sxc5#
      • 2.Rf4#
    • 1...Rf3
      • 2.Sxc5#
    • 1...Rg3
      • 2.Sxc5#
    • 1...c4
      • 2.Sc5#
      • 2.Rd4#
  • Tries
    • 1.Qg4+?
      • 1...Qxg4
        • 2.Sxc3#
      • 1...Sxg4!
    • 1.Qh4+?
      • 1...Qg4
        • 2.Sxc3#
      • 1...Qxh4
        • 2.Sxc3#
      • 1...Sg4!
  • Keys
    • 1.Bf4!
      • threat
        • 2.Qxe5#
      • 1...Qxe6
        • 2.Sxc3#
      • 1...Qxh5
        • 2.Sxc3#
      • 1...Qf5
        • 2.Sxc3#
        • 2.Qxf5#
      • 1...Rg5
        • 2.Sxg5#
      • 1...Sd3
        • 2.Sxc3#
      • 1...Sf3
        • 2.Sxc3#
      • 1...Sc4
        • 2.Sxc5#
      • 1...Sg4
        • 2.Qf5#
      • 1...Sc6
        • 2.Qd5#
      • 1...Sg6
        • 2.Sg5#
      • 1...Sd7
        • 2.Bxb7#
      • 1...Sf7
        • 2.Bxb7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 8
  • Sets
    • Q(c);N_GUARD::S(B),XR(b)
    • Q(c);N_GUARD,XS(H)::S(B),XR(b)
    • Q(c);N_GUARD,XQ(F)::S(B),XR(b)
    • R(b);N_GUARD::S(H),XP(e)
  • Tries
    • Try
      • Q(F);CHECK
      • Vars
        • Q(c);XQ(F)::S(B),XR(b)
      • Refutation
        • S(f);XQ(F)
    • Try
      • Q(F);CHECK
      • Vars
        • Q(c);P_SPINQ(c)::S(B),XR(b)
        • Q(c);XQ(F)::S(B),XR(b)
      • Refutation
        • S(f);P_SPINS(f)
  • Actual
    • B(E);
    • Threat
      • QAR1(F),XS(f)
    • Vars
      • Q(c);N_GUARD,XS(H)::S(B),XR(b)
      • Q(c);N_GUARD,XQ(F)::S(B),XR(b)
      • R(h);N_GUARD::S(H),XR(h)
      • S(f);S_CUTQ(c)::S(B),XR(b)
      • S(f);S_CUTR(b)::S(H),XP(e)
      • S(f);S_CUTQ(c)::QAB1(F)
      • S(f);OGATE::QAB1(F)
      • S(f);S_CUTR(h)::S(H)
      • S(f);N_GUARD,S_CUTR(h)::B(G),XB(g)
HTML5 logo

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).