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Problem Display

PID: 139822 (8/1P3N1B/q1R5/2n3N1/r2pPk1K/Pr4R1/1BpPbn2/3Q4 w - - 0 1)

Davis, Edward

The Problemist, 1937

8/1P3N1B/q1R5/2n3N1/r2pPk1K/Pr4R1/1BpPbn2/3Q4

#2

12 + 9

SOLUTION

SOUND
Sets
- 1...Qd3
  - 2.Rf6#
- 1...Qc4
  - 2.Rf6#
- 1...Qb5
  - 2.Rf6#
- 1...Qxb7
  - 2.Rf6#
- 1...Qa5
  - 2.Rf6#
- 1...Qa7
  - 2.Rf6#
- 1...Qa8
  - 2.Rf6#
- 1...Rbxa3
  - 2.b8Q#
  - 2.b8B#
- 1...Rc3
  - 2.b8Q#
  - 2.b8B#
- 1...Rd3
  - 2.b8Q#
  - 2.b8B#
- 1...Re3
  - 2.b8Q#
  - 2.b8B#
- 1...Rf3
  - 2.b8Q#
  - 2.b8B#
- 1...Rxg3
  - 2.b8Q#
  - 2.b8B#
- 1...Bd3
  - 2.Rf3#
  - 2.Qf3#
- 1...Bb5
  - 2.b8Q#
  - 2.b8B#
- 1...Sxd1
  - 2.Sh3#
- 1...Sh1
  - 2.Sh3#
- 1...Sfd3
  - 2.Sh3#
- 1...Sh3
  - 2.Sxh3#
- 1...Sfxe4
  - 2.Sh3#
- 1...Sg4
  - 2.Sh3#
- 1...Scd3
  - 2.Se6#
- 1...Scxe4
  - 2.Se6#
- 1...Se6
  - 2.Sxe6#
- 1...Sxb7
  - 2.Se6#
- 1...Sd7
  - 2.Se6#
- 1...d3
  - 2.Be5#
Tries
- 1.Bxd4?
  - threat
    - 2.Be5#
  - 1...Sfd3
    - 2.Sh3#
    - 2.Be3#
  - 1...Sg4
    - 2.Sh3#
  - 1...Scd3
    - 2.Se6#
    - 2.Be3#
  - 1...Sd7
    - 2.Se6#
  - 1...Rxd4!
- 1.Rf3+?
  - 1...Rxf3
    - 2.b8Q#
    - 2.b8B#
  - 1...Bxf3!
Keys
- 1.Qc1!
  - threat
    - 2.d3#
  - 1...Rxg3
    - 2.b8Q#
    - 2.b8B#
  - 1...Sfxe4
    - 2.Sh3#
  - 1...Scxe4
    - 2.Se6#
  - 1...Qd3
    - 2.Rf6#
  - 1...Qa5
    - 2.Rf6#
  - 1...Rd3
    - 2.b8Q#
    - 2.b8B#
  - 1...Re3
    - 2.b8Q#
    - 2.b8B#
  - 1...Rf3
    - 2.b8Q#
    - 2.b8B#
  - 1...Bd3
    - 2.Rf3#
  - 1...Sd1
    - 2.Sh3#
  - 1...Sfd3
    - 2.Sh3#
  - 1...Sg4
    - 2.Sh3#
  - 1...Scd3
    - 2.Se6#
  - 1...d3
    - 2.Be5#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 1
- REMOVED MATES = 10
Sets
- Q(i);N_GUARD::R(I)
- Q(i);N_GUARD,XP(J)::R(I)
- R(d);N_GUARD,XP(D)::P=Q
- R(d);N_GUARD::P=Q
- R(d);N_GUARD,XR(E)::P=Q
- B(b);S_CUTR(d)::P=Q
- S(c);N_GUARD,XQ(A)::S(H)
- S(c);N_GUARD::S(H)
- S(c);N_GUARD::S(H),XS(c)
- S(c);N_GUARD,XP(F)::S(H)
- S(h);N_GUARD::S(H)
- S(h);N_GUARD,XP(F)::S(H)
- S(h);N_GUARD::S(H),XS(h)
- S(h);N_GUARD,XP(J)::S(H)
- P(f);OGATE::B(B)
Tries
- Try
  - B(B);XP(f)
  - Threat
    - B(B)
  - Vars
    - S(c);N_GUARD::S(H)
    - S(h);N_GUARD::S(H)
  - Refutation
    - R(e);XB(B)
- Try
  - R(E);CHECK
  - Vars
    - R(d);XR(E)::P=Q
  - Refutation
    - B(b);XR(E)
Actual
- Q(A);
- Threat
  - QAB(A)+P(C)
- Vars
  - R(d);N_GUARD,XR(E)::P=Q
  - S(c);N_GUARD,XP(F)::S(H)
  - S(h);N_GUARD,XP(F)::S(H)
  - Q(i);N_GUARD::R(I)
  - R(d);N_GUARD::P=Q
  - B(b);N_GUARD,S_CUTR(d)::R1(E)
  - S(c);N_GUARD::S(H)
  - S(h);N_GUARD::S(H)
  - P(f);OGATE::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).