MESON Chess Problem Database

Problem Display
PID: 203499 (q2NnK2/1pP2RP1/4N3/r2Bkp2/1Qp2p1B/2pR4/8/b7 w - - 0 1)

Mari, Alberto

L'Alfiere di Re, 1924

q2NnK2/1pP2RP1/4N3/r2Bkp2/1Qp2p1B/2pR4/8/b7

#2

10 + 10

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sd6
      • 2.Bf6#
    • 1...Sf6
      • 2.Bxf6#
    • 1...Sxc7
      • 2.Bf6#
    • 1...Sxg7
      • 2.Bf6#
  • Tries
    • 1.Re3+?
      • 1...Kxd5
        • 2.Rxf5#
      • 1...fxe3!
    • 1.Qd6+?
      • 1...Sxd6
        • 2.Bf6#
      • 1...Kxd6!
    • 1.Qxc4?
      • threat
        • 2.Qxf4#
      • 1...Kd6
        • 2.Qxf4#
      • 1...f3
        • 2.Qf4#
      • 1...Ra4!
  • Keys
    • 1.Re7!
      • threat
        • 2.Sf7#
      • 1...Qxd8
        • 2.Sxd8#
      • 1...Rxd5
        • 2.Sd4#
      • 1...Sxc7
        • 2.Sxc7#
      • 1...Sxg7
        • 2.Sxg7#
      • 1...cxd3
        • 2.Sxf4#
      • 1...Sd6
        • 2.Sc5#
      • 1...Sf6
        • 2.Sg5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • S(j);N_GUARD,P_PINS(I)::B(C)
    • S(j);N_GUARD,P_PINS(I)::B(C),XS(j)
    • S(j);N_GUARD,P_PINS(I),XP(F)::B(C)
    • S(j);N_GUARD,P_PINS(I),XP(H)::B(C)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • K(f);P-FLIGHT,XB(D)::R(G),XP(g)
      • Refutation
        • P(d);XR(A)
    • Try
      • Q(B);CHECK
      • Vars
        • S(j);P_PINS(I),SBLOCK,XQ(B)::B(C)
      • Refutation
        • K(f);S_FLIGHT,XQ(B)
    • Try
      • Q(B);XP(c)
      • Threat
        • QAB1(B),XP(d)
      • Vars
        • K(f);S_FLIGHT::QAB(B),XP(d)
        • P(d);::QAB1(B)
      • Refutation
        • R(e);
  • Actual
    • R(G);
    • Threat
      • S(I)
    • Vars
      • Q(i);XS(I)::R(G)+S(E),XQ(i)
      • R(e);SBLOCK,XB(D)::R(G)+S(E)
      • S(j);P_PINS(I),XP(F)::R(G)+S(E),XS(j)
      • S(j);P_PINS(I),XP(H)::R(G)+S(E),XS(j)
      • P(c);XR(A)::R(G)+S(E),XP(d)
      • S(j);P_PINS(I),SBLOCK::R(G)+S(E)
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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).