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Problem Display

PID: 140516 (4N3/1b2R3/2p3K1/p1rkb3/8/n3P3/2N1BP2/8 w - - 0 1)

Pickering, GE

Chess Amateur (The), 1911

4N3/1b2R3/2p3K1/p1rkb3/8/n3P3/2N1BP2/8

#2

7 + 7

SOLUTION

SOUND
Sets
- 1...Ke4
  - 2.Sf6#
- 1...Ba1
  - 2.e4#
- 1...Bb2
  - 2.e4#
- 1...Bh2
  - 2.e4#
- 1...Bc3
  - 2.e4#
- 1...Bg3
  - 2.e4#
- 1...Bd4
  - 2.e4#
- 1...Bf4
  - 2.e4#
- 1...Bd6
  - 2.Sf6#
  - 2.e4#
- 1...Bf6
  - 2.e4#
- 1...Bc7
  - 2.e4#
- 1...Bg7
  - 2.e4#
- 1...Bb8
  - 2.e4#
- 1...Bh8
  - 2.e4#
- 1...Sc4
  - 2.Bf3#
Tries
- 1.Kf5?
  - threat
    - 2.Rxe5#
    - 2.e4#
  - 1...Rxc2
    - 2.Rxe5#
  - 1...Sxc2
    - 2.Rxe5#
  - 1...Rc3
    - 2.Rxe5#
  - 1...Rc4
    - 2.Rxe5#
  - 1...Rb5
    - 2.Rxe5#
  - 1...Ba1
    - 2.Rd7#
    - 2.e4#
  - 1...Bb2
    - 2.Rd7#
    - 2.e4#
  - 1...Bh2
    - 2.e4#
  - 1...Bc3
    - 2.Rd7#
    - 2.e4#
  - 1...Bg3
    - 2.e4#
  - 1...Bd4
    - 2.Rd7#
    - 2.e4#
  - 1...Bf4
    - 2.e4#
  - 1...Bd6
    - 2.Sf6#
    - 2.e4#
  - 1...Bf6
    - 2.Rd7#
    - 2.e4#
  - 1...Bc7
    - 2.e4#
  - 1...Bg7
    - 2.Rd7#
    - 2.e4#
  - 1...Bb8
    - 2.e4#
  - 1...Bh8
    - 2.Rd7#
    - 2.e4#
  - 1...Sc4
    - 2.Bf3#
    - 2.e4#
  - 1...Bc8+!
- 1.Sb4+?
  - 1...Ke4
    - 2.Sd6#
    - 2.Sf6#
  - 1...axb4!
- 1.Rd7+?
  - 1...Ke4
    - 2.f3#
  - 1...Ke6
    - 2.Bg4#
  - 1...Bd6!
Keys
- 1.f4!
  - threat
    - 2.Rxe5#
  - 1...Ke4
    - 2.Sf6#
  - 1...Bxf4
    - 2.e4#
  - 1...Ba1
    - 2.e4#
  - 1...Bb2
    - 2.e4#
  - 1...Bc3
    - 2.e4#
  - 1...Bd4
    - 2.e4#
  - 1...Bd6
    - 2.Sf6#
    - 2.e4#
  - 1...Bf6
    - 2.e4#
  - 1...Bc7
    - 2.e4#
  - 1...Bg7
    - 2.e4#
  - 1...Bb8
    - 2.e4#
  - 1...Bh8
    - 2.e4#
  - 1...Sc4
    - 2.Bf3#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 0
- REMOVED MATES = 2
Sets
- K(d);P_SPINB(e),S_FLIGHT::S(G)
- B(e);::P(D)
- S(a);SBLOCK::B(B)
Tries
- Try
  - K(E);S_FLIGHT
  - Threat
    - DUALS(2)
  - Vars
    - R(c);XS(A)::R1(F),XB(e)
    - S(a);XS(A)::R1(F),XB(e)
    - R(c);::R1(F),XB(e)
    - B(e);::P(D)
  - Refutation
    - B(g);CHECK
- Try
  - S(A);CHECK
  - Refutation
    - P(b);XS(A)
- Try
  - R(F);CHECK
  - Vars
    - K(d);S_FLIGHT::P(C)
    - K(d);S_FLIGHT::B(B)
  - Refutation
    - B(e);P_SPINB(e)
Actual
- P(C);
- Threat
  - R1(F),XB(e)
- Vars
  - K(d);P_SPINB(e),S_FLIGHT::S(G)
  - B(e);XP(C)::P(D)
  - B(e);::P(D)
  - S(a);SBLOCK::B(B)

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).