Meson Chess Problem Database

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Problem Display

PID: 143412 (1B1Nn2n/5b1Q/NR6/r2k1P2/p5pb/3K4/8/3B4 w - - 0 1)

Anonymous

Hackney Mercury, 1894

1B1Nn2n/5b1Q/NR6/r2k1P2/p5pb/3K4/8/3B4

#2

8 + 8

SOLUTION

SOUND
Sets
- 1...Rb5
  - 2.Rxb5#
- 1...Rc5
  - 2.Sb4#
- 1...Rxa6
  - 2.Rb5#
- 1...Be1
  - 2.Qh1#
- 1...Bf2
  - 2.Qh1#
- 1...Bg3
  - 2.Qh1#
- 1...Bg5
  - 2.Qh1#
- 1...Bf6
  - 2.Qh1#
- 1...Be7
  - 2.Qh1#
- 1...Bxd8
  - 2.Qh1#
- 1...Bh5
  - 2.Qb7#
- 1...Be6
  - 2.Qb7#
- 1...Bg6
  - 2.Qb7#
- 1...Bg8
  - 2.Qb7#
- 1...Sg6
  - 2.Qxf7#
- 1...a3
  - 2.Bb3#
- 1...g3
  - 2.Bf3#
Tries
- 1.Bg3?
  - 1...Rxa6
    - 2.Rb5#
  - 1...Bxd8
    - 2.Qh1#
  - 1...Rb5
    - 2.Rxb5#
  - 1...Rc5
    - 2.Sb4#
  - 1...Bg5
    - 2.Qh1#
  - 1...Bf6
    - 2.Qh1#
  - 1...Be7
    - 2.Qh1#
  - 1...Bh5
    - 2.Qb7#
  - 1...Be6
    - 2.Qb7#
  - 1...Bg6
    - 2.Qb7#
  - 1...Bg8
    - 2.Qb7#
  - 1...Sd6
    - 2.Rxd6#
  - 1...Sf6
    - 2.Rd6#
  - 1...Sc7
    - 2.Rd6#
  - 1...Sg7
    - 2.Rd6#
  - 1...Sg6
    - 2.Qxf7#
  - 1...a3
    - 2.Bb3#
  - 1...Bxg3!
Keys
- 1.Bf4!
  - 1...Rxa6
    - 2.Rb5#
  - 1...Bxd8
    - 2.Qh1#
  - 1...Rb5
    - 2.Rxb5#
  - 1...Rc5
    - 2.Sb4#
  - 1...Be1
    - 2.Qh1#
  - 1...Bf2
    - 2.Qh1#
  - 1...Bg3
    - 2.Qh1#
  - 1...Bg5
    - 2.Qh1#
  - 1...Bf6
    - 2.Qh1#
  - 1...Be7
    - 2.Qh1#
  - 1...Bh5
    - 2.Qb7#
  - 1...Be6
    - 2.Qb7#
  - 1...Bg6
    - 2.Qb7#
  - 1...Bg8
    - 2.Qb7#
  - 1...Sd6
    - 2.Rxd6#
  - 1...Sf6
    - 2.Rd6#
  - 1...Sc7
    - 2.Rd6#
  - 1...Sg7
    - 2.Rd6#
  - 1...Sg6
    - 2.Qxf7#
  - 1...a3
    - 2.Bb3#
  - 1...g3
    - 2.Bf3#

FEATURES

Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 0
Sets
- R(d);N_GUARD::R(E),XR(d)
- R(d);SBLOCK::S(D)
- R(d);N_GUARD,XS(D)::R(E)
- B(c);OGATE::QAB(F)
- B(c);OGATE,XS(H)::QAB(F)
- B(f);OGATE::QAB(F)
- B(f);OGATE,P_PINP(C)::QAB(F)
- S(h);N_GUARD::QAB(F),XB(f)
- P(a);N_GUARD::B(A)
- P(b);N_GUARD::B(A)
Tries
- Try
  - B(G);
  - Vars
    - R(d);N_GUARD,XS(D)::R(E)
    - B(c);OGATE,XS(H)::QAB(F)
    - R(d);N_GUARD::R(E),XR(d)
    - R(d);SBLOCK::S(D)
    - B(c);OGATE::QAB(F)
    - B(f);OGATE::QAB(F)
    - B(f);OGATE,P_PINP(C)::QAB(F)
    - S(g);N_GUARD::R1(E),XS(g)
    - S(g);N_GUARD::R1(E)
    - S(h);N_GUARD::QAB(F),XB(f)
    - P(a);N_GUARD::B(A)
  - Refutation
    - B(c);XB(G)
Actual
- B(G);
- Vars
  - R(d);N_GUARD,XS(D)::R(E)
  - B(c);OGATE,XS(H)::QAB(F)
  - R(d);N_GUARD::R(E),XR(d)
  - R(d);SBLOCK::S(D)
  - B(c);OGATE::QAB(F)
  - B(f);OGATE::QAB(F)
  - B(f);OGATE,P_PINP(C)::QAB(F)
  - S(g);N_GUARD::R1(E),XS(g)
  - S(g);N_GUARD::R1(E)
  - S(h);N_GUARD::QAB(F),XB(f)
  - P(a);N_GUARD::B(A)
  - P(b);N_GUARD::B(A)

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).