MESON Chess Problem Database

Problem Display
PID: 204419 (4R3/1NKp1p2/1p1Qq1n1/4bR2/1Nppk1P1/2r5/4B3/4n1B1 w - - 0 1)

Mari, Alberto

Good Companions, 1925

4R3/1NKp1p2/1p1Qq1n1/4bR2/1Nppk1P1/2r5/4B3/4n1B1

#2

9 + 11

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd6+
      • 2.Sxd6#
    • 1...Bxd6+
      • 2.Sxd6#
    • 1...Bf6
      • 2.Qd5#
    • 1...Bg7
      • 2.Qd5#
    • 1...Bh8
      • 2.Qd5#
    • 1...Sd3
      • 2.Bf3#
    • 1...b5
      • 2.Sc5#
  • Tries
    • 1.Qxe5+?
      • 1...Qxe5+
        • 2.Sd6#
      • 1...Sxe5!
  • Keys
    • 1.Kxb6!
      • threat
        • 2.Sc5#
      • 1...Qxd6+
        • 2.Sxd6#
      • 1...Qxf5
        • 2.Qxd4#
      • 1...Bxd6
        • 2.Sxd6#
      • 1...Qd5
        • 2.Qxd5#
      • 1...Sd3
        • 2.Bf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 4
  • Sets
    • Q(h);CHECK,P_SPINB(f),XQ(F)::S(G),XQ(h)
    • B(f);CHECK,P_SPINQ(h),XQ(F)::S(G),XB(f)
    • B(f);N_PINQ(F),P_SPINQ(h)::QAB1(F)
    • S(a);N_GUARD,S_CUTR(b)::B(B)
    • P(g);N_GUARD::S(G)
  • Tries
    • Try
      • Q(F);CHECK,N_SPINQ(F),XB(f)
      • Vars
        • Q(h);CHECK,P_SPINQ(h),XQ(F)::S(G)
      • Refutation
        • S(i);XQ(F)
  • Actual
    • K(H);S_FLIGHT,XP(g)
    • Threat
      • S(G)
    • Vars
      • Q(h);CHECK,P_SPINB(f),XQ(F)::S(G),XQ(h)
      • Q(h);N_PINQ(F),P_SPINB(f),XR(E)::QAR1(F),XP(d)
      • B(f);P_SPINQ(h),XQ(F)::S(G),XB(f)
      • Q(h);N_PINQ(F),P_SPINB(f)::QAB1(F),XQ(h)
      • S(a);N_GUARD,S_CUTR(b)::B(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).