MESON Chess Problem Database

Problem Display
PID: 198150 (2R3bB/3PP2P/1pB5/1P2n1pq/1Pk4r/K1p1p2r/2P1P1Q1/1b1RNN2 w - - 0 1)

Ceriani, Luigi

Good Companions, 1920

2R3bB/3PP2P/1pB5/1P2n1pq/1Pk4r/K1p1p2r/2P1P1Q1/1b1RNN2

#2

15 + 11

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rh1
      • 2.Sxe3#
    • 1...Rh2
      • 2.Sxe3#
    • 1...Re4
      • 2.Qxe4#
    • 1...Bd5
      • 2.Qxd5#
    • 1...Bxh7
      • 2.Qd5#
    • 1...Sd3
      • 2.exd3#
    • 1...Sf3
      • 2.Sxe3#
    • 1...Sg4
      • 2.Rd4#
      • 2.Qe4#
    • 1...Sxc6
      • 2.Qxc6#
    • 1...Sg6
      • 2.hxg8Q#
      • 2.hxg8B#
    • 1...Sxd7
      • 2.Bxd7#
    • 1...Sf7
      • 2.Qd5#
    • 1...g4
      • 2.Qe4#
  • Tries
    • 1.Ka4?
      • threat
        • 2.Bd5#
      • 1...Sxc6
        • 2.Rxc6#
        • 2.Qxc6#
      • 1...Bd5
        • 2.Bxd5#
        • 2.Qxd5#
      • 1...Bxc2+!
    • 1.Be4+?
      • 1...Sc6
        • 2.Bd3#
      • 1...Kxb5!
    • 1.Bb7+?
      • 1...Sc6
        • 2.Qxc6#
      • 1...Kxb5!
    • 1.Ba8+?
      • 1...Sc6
        • 2.Qxc6#
      • 1...Kxb5!
    • 1.hxg8Q+?
      • 1...Sf7
        • 2.Qd5#
      • 1...Qf7!
    • 1.hxg8B+?
      • 1...Sf7
        • 2.Qd5#
      • 1...Qf7!
  • Keys
    • 1.Sd3!
      • threat
        • 2.Sxe5#
      • 1...Kd4
        • 2.Sb2#
        • 2.Sxe5#
      • 1...Sxd3
        • 2.exd3#
      • 1...Sxc6
        • 2.Qxc6#
      • 1...Sxd7
        • 2.Bxd7#
      • 1...Re4
        • 2.Qxe4#
      • 1...Sf3
        • 2.Sxe3#
      • 1...Sg4
        • 2.Qe4#
      • 1...Sg6
        • 2.hxg8Q#
        • 2.hxg8B#
      • 1...Sf7
        • 2.Qd5#
      • 1...g4
        • 2.Qe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • R(d);N_GUARD::S(C),XP(c)
    • R(f);N_GUARD::QAR2(F),XR(f)
    • B(k);N_GUARD::QAB1(F),XB(k)
    • B(k);N_GUARD,XP(M)::QAB1(F)
    • S(g);OGATE::P(E),XS(g)
    • S(g);S_CUTR(d)::S(C),XP(c)
    • S(g);OGATE,P_SPINS(g),XB(J)::QAR2(F),XS(g)
    • S(g);N_GUARD,S_CUTQ(i)::PXB(k)=Q
    • S(g);OGATE,XP(K)::R(N)+B(J),XS(g)
    • S(g);S_CUTB(k)::QAB1(F)
    • P(h);S_CUTR(f)::QAR2(F)
  • Tries
    • Try
      • K(G);P-FLIGHT
      • Threat
        • R(N)+B(J),DCHECK
      • Refutation
        • B(a);CHECK,XP(D)
    • Try
      • B(J);CHECK
      • Vars
        • S(g);P_SPINS(g)::B(J)
      • Refutation
        • K(e);S_FLIGHT,XP(I)
    • Try
      • B(J);CHECK
      • Vars
        • S(g);N_GUARD,P_SPINS(g)::QAR2(F),XS(g)
      • Refutation
        • K(e);S_FLIGHT,XP(I)
    • Try
      • B(J);CHECK
      • Vars
        • S(g);N_GUARD,P_SPINS(g)::QAR2(F),XS(g)
      • Refutation
        • K(e);S_FLIGHT,XP(I)
    • Try
      • P(M);CHECK,XB(k)
      • Vars
        • S(g);P_SPINS(g)::QAB1(F)
      • Refutation
        • Q(i);P_SPINQ(i)
    • Try
      • P(M);CHECK,XB(k)
      • Vars
        • S(g);P_SPINS(g)::QAB1(F)
      • Refutation
        • Q(i);P_SPINQ(i)
  • Actual
    • S(B);
    • Threat
      • S(B),XS(g)
    • Vars
      • S(g);OGATE,XS(B)::P(E),XS(g)
      • S(g);OGATE,P_SPINS(g),XB(J)::QAR2(F),XS(g)
      • S(g);OGATE,XP(K)::R(N)+B(J),XS(g)
      • R(f);N_GUARD::QAR2(F),XR(f)
      • S(g);S_CUTR(d)::S(C),XP(c)
      • S(g);S_CUTR(f)::QAR2(F)
      • S(g);N_GUARD,S_CUTQ(i)::PXB(k)=Q
      • S(g);S_CUTB(k)::QAB1(F)
      • P(h);S_CUTR(f)::QAR2(F)
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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).