MESON Chess Problem Database

Problem Display
PID: 110500 (8/8/1KQ1b1R1/4k3/8/7N/8/8 w - - 0 1)

Lech, Anton

Raketa, 1943

8/8/1KQ1b1R1/4k3/8/7N/8/8

#2

4 + 2

5454 Near Snap 2009
6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kf5
      • 2.Qxe6#
  • Tries
    • 1.Kc5?
      • threat
        • 2.Qxe6#
      • 1...Kf5
        • 2.Qxe6#
      • 1...Bd5
        • 2.Qxd5#
      • 1...Ba2
        • 2.Rg5#
      • 1...Bb3
        • 2.Rg5#
      • 1...Bc4
        • 2.Rg5#
      • 1...Bg4
        • 2.Qd5#
      • 1...Bf5
        • 2.Qd5#
      • 1...Bd7
        • 2.Qd5#
      • 1...Bf7
        • 2.Rg5#
      • 1...Bc8
        • 2.Qd5#
      • 1...Bg8
        • 2.Rg5#
      • 1...Bxh3!
    • 1.Rxe6+?
      • 1...Kf5
        • 2.Qe4#
      • 1...Kd4!
    • 1.Qe4+?
      • 1...Kd6
        • 2.Qxe6#
      • 1...Kxe4!
  • Keys
    • 1.Sf2!
      • 1...Kd4
        • 2.Qc5#
      • 1...Kf4
        • 2.Qe4#
      • 1...Kf5
        • 2.Qe4#
      • 1...Ba2
        • 2.Qe4#
      • 1...Bb3
        • 2.Qe4#
      • 1...Bh3
        • 2.Qe4#
      • 1...Bc4
        • 2.Qe4#
      • 1...Bg4
        • 2.Qe4#
      • 1...Bd5
        • 2.Qf6#
      • 1...Bf5
        • 2.Qd6#
      • 1...Bd7
        • 2.Qe4#
      • 1...Bf7
        • 2.Qe4#
      • 1...Bc8
        • 2.Qe4#
      • 1...Bg8
        • 2.Qe4#

Anticipated by 21964(1922)

This anticipates 176189(1968), 34901(1998)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 13
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::QAB1(C),XB(b)
  • Tries
    • Try
      • K(B);S_FLIGHT
      • Threat
        • QAR1(C),XB(b)
      • Vars
        • K(a);P-FLIGHT::QAB1(C),XB(b)
        • B(b);N_GUARD::QAR1(C),XB(b)
        • B(b);N_GUARD::R(D)
        • B(b);N_GUARD::QAR1(C)
        • B(b);N_GUARD,SBLOCK::QAR1(C)
      • Refutation
        • B(b);XS(A)
    • Try
      • R(D);CHECK,XB(b)
      • Vars
        • K(a);P-FLIGHT::QAB1(C)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • Q(C);CHECK
      • Vars
        • K(a);OGATE,P_SPINB(b),S_FLIGHT::QAR1(C),XB(b)
      • Refutation
        • K(a);P-FLIGHT,XQ(C)
  • Actual
    • S(A);
    • Vars
      • K(a);S_FLIGHT::QAB1(C)
      • K(a);S_FLIGHT::QAR1(C)
      • K(a);P-FLIGHT::QAB1(C)
      • B(b);::QAR1(C)
      • B(b);OGATE,SBLOCK::QAB1(C)
      • B(b);SBLOCK::QAB1(C)
HTML5 logo

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).