MESON Chess Problem Database

Problem Display
PID: 152139 (K1N5/2pQ3p/n3p2r/2pPkbP1/8/1P2PPp1/1R5q/B1r1N3 w - - 0 1)

Ellerman, Arnoldo

Good Companions (April), 1915

K1N5/2pQ3p/n3p2r/2pPkbP1/8/1P2PPp1/1R5q/B1r1N3

#2

11 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Rc2
      • 2.Rxc2#
    • 1...Bg6
      • 2.Qxe6#
    • 1...c6
      • 2.Qd6#
  • Tries
    • 1.Rb1+?
      • 1...Rc3
        • 2.Bxc3#
      • 1...Qb2!
    • 1.Rd2+?
      • 1...Rc3
        • 2.Bxc3#
      • 1...Rxa1!
    • 1.Re2+?
      • 1...Rc3
        • 2.Bxc3#
      • 1...Rxa1!
    • 1.Rf2+?
      • 1...Rc3
        • 2.Bxc3#
      • 1...Rxa1!
    • 1.Rg2+?
      • 1...Rc3
        • 2.Bxc3#
      • 1...Rxa1!
    • 1.Rxh2+?
      • 1...Rc3
        • 2.Bxc3#
      • 1...Rxa1!
    • 1.Qxc7+?
      • 1...Kxd5
        • 2.Sb6#
        • 2.Se7#
        • 2.Qd6#
      • 1...Sxc7+!
  • Keys
    • 1.Se7!
      • threat
        • 2.Sc6#
      • 1...exd5
        • 2.Qxd5#
      • 1...Bb1
        • 2.Rc2#
      • 1...Bc2
        • 2.Rb1#
      • 1...Bd3
        • 2.Sxd3#
      • 1...Bh3
        • 2.Sd3#
      • 1...Be4
        • 2.f4#
      • 1...Bg4
        • 2.Sd3#
      • 1...Bg6
        • 2.Qxe6#
      • 1...Sb4
        • 2.Qxc7#
      • 1...Sb8
        • 2.Qxc7#
      • 1...c6
        • 2.Sxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 9
    • REMOVED MATES = 1
  • Sets
    • R(a);N_GUARD::B(A)+R(C),XR(a)
    • B(f);N_GUARD,S_CUTR(i)::QAR1(I),XP(h)
    • P(j);N_GUARD::QAB1(I)
  • Tries
    • Try
      • R(C);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::B(A),XR(a)
      • Refutation
        • Q(b);P_SPINQ(b)
    • Try
      • R(C);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::B(A),XR(a)
      • Refutation
        • R(a);XB(A)
    • Try
      • R(C);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::B(A),XR(a)
      • Refutation
        • R(a);XB(A)
    • Try
      • R(C);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::B(A),XR(a)
      • Refutation
        • R(a);XB(A)
    • Try
      • R(C);CHECK
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::B(A),XR(a)
      • Refutation
        • R(a);XB(A)
    • Try
      • R(C);CHECK,XQ(b)
      • Vars
        • R(a);N_GUARD,P_SPINR(a)::B(A),XR(a)
      • Refutation
        • R(a);XB(A)
    • Try
      • Q(I);CHECK,XP(j)
      • Refutation
        • S(g);CHECK,XQ(I)
  • Actual
    • S(K);
    • Threat
      • S(K)
    • Vars
      • P(h);OGATE,XP(G)::QAR1(I),XP(h)
      • B(f);S_CUTR(a)::B(A)+R(C)
      • B(f);S_CUTQ(b),S_CUTR(a)::B(A)+R(C)
      • B(f);N_GUARD::S(B),XB(f)
      • B(f);N_GUARD::S(B)
      • B(f);P_PINP(G),SBLOCK::P(F)
      • B(f);N_GUARD,S_CUTR(i)::QAR1(I),XP(h)
      • S(g);N_GUARD::QAB(I),XP(j)
      • P(j);::S(K),XP(j)
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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).