MESON Chess Problem Database

Problem Display
PID: 132403 (8/4p1KQ/2p5/R2pk1N1/7R/2N4B/b6p/B4r1q w - - 0 1)

Koltanowski, George

Source?, 0000

8/4p1KQ/2p5/R2pk1N1/7R/2N4B/b6p/B4r1q

#2

8 + 8

2425 San Francisco Chronicle 0000

SOLUTION

  • SOUND
  • Sets
    • 1...Rxa1
      • 2.Sf7#
    • 1...Rb1
      • 2.Sf7#
    • 1...Rc1
      • 2.Sf7#
    • 1...Rd1
      • 2.Sf7#
    • 1...Re1
      • 2.Sf7#
    • 1...Rf7+
      • 2.Sxf7#
    • 1...Bb1
      • 2.Sce4#
  • Tries
    • 1.Sxa2+?
      • 1...Rxa1
        • 2.Sf7#
      • 1...Kd6!
    • 1.Se2+?
      • 1...Rxa1
        • 2.Sf7#
      • 1...Kd6!
    • 1.Sa4+?
      • 1...Rxa1
        • 2.Sf7#
      • 1...Kd6!
    • 1.Sb5+?
      • 1...Rxa1
        • 2.Sf7#
        • 2.Qf5#
      • 1...d4!
    • 1.Sxd5+?
      • 1...Rxa1
        • 2.Sf7#
      • 1...Kd6!
  • Keys
    • 1.Qb1!
      • threat
        • 2.Sce4#
        • 2.Qb8#
      • 1...Rf7+
        • 2.Sxf7#
      • 1...Kd6
        • 2.Qb8#
      • 1...Rxb1
        • 2.Sf7#
      • 1...Bxb1
        • 2.Sce4#
      • 1...Qe4
        • 2.Scxe4#
      • 1...Rf4
        • 2.Sce4#
      • 1...Qg2
        • 2.Qb8#
      • 1...Qf3
        • 2.Qb8#
      • 1...Qg1
        • 2.Qb8#
      • 1...Rc1
        • 2.Sf7#
        • 2.Qb8#
      • 1...Rd1
        • 2.Sf7#
        • 2.Qb8#
      • 1...Rf2
        • 2.Qb8#
      • 1...Rf3
        • 2.Qb8#
      • 1...Rf6
        • 2.Sce4#
      • 1...Rf8
        • 2.Sce4#
      • 1...Bb3
        • 2.Sce4#
      • 1...c5
        • 2.Qb8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 12
    • REMOVED MATES = 4
  • Sets
    • R(a);N_GUARD,XB(A)::S(F)
    • R(a);N_GUARD::S(F)
    • R(a);CHECK,N_GUARD::S(F),XR(a)
    • B(c);S_CUTR(a)::B(A)+S(B)
  • Tries
    • Try
      • S(B);CHECK,XB(c)
      • Vars
        • R(a);XB(A)::S(F)
      • Refutation
        • K(f);N_SPINP(e),S_FLIGHT
    • Try
      • S(B);CHECK
      • Vars
        • R(a);XB(A)::S(F)
      • Refutation
        • K(f);N_SPINP(e),S_FLIGHT
    • Try
      • S(B);CHECK
      • Vars
        • R(a);XB(A)::S(F)
      • Refutation
        • K(f);N_SPINP(e),S_FLIGHT
    • Try
      • S(B);CHECK,N_PINP(e)
      • Refutation
        • P(e);P_SPINP(e)
    • Try
      • S(B);CHECK,XP(e)
      • Vars
        • R(a);XB(A)::S(F)
      • Refutation
        • K(f);S_FLIGHT
  • Actual
    • Q(H);
    • Threat
      • DUALS(2)
    • Vars
      • R(a);CHECK,N_GUARD::S(F),XR(a)
      • K(f);N_SPINP(e),S_FLIGHT::QAB(H)
      • R(a);N_GUARD,XQ(H)::S(F)
      • B(c);XQ(H)::B(A)+S(B)
      • Q(b);::B(A)+S(B),XQ(b)
      • R(a);::B(A)+S(B)
      • Q(b);P_PINS(F)::QAB(H)
      • Q(b);::QAB(H)
      • R(a);::QAB(H)
      • B(c);::B(A)+S(B)
      • P(g);N_SPINP(e)::QAB(H)
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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).