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Problem Display

PID: 224477 (8/2p4p/B1r1P2n/4b2Q/2p1kp2/1N1R4/5P2/1K6 w - - 0 1)

Hamilton, Charles Dingee Pennock

Philadelphia Times, 1888

8/2p4p/B1r1P2n/4b2Q/2p1kp2/1N1R4/5P2/1K6

#2

7 + 8

6490	yacpdb	2020

SOLUTION

SOUND
Sets
- 1...Kxd3
  - 2.Qf3#
- 1...Rc5
  - 2.Sxc5#
- 1...Rxa6
  - 2.Sc5#
- 1...Rd6
  - 2.Sc5#
- 1...Rxe6
  - 2.Sc5#
- 1...Ba1
  - 2.Qd5#
- 1...Bb2
  - 2.Qd5#
- 1...Bc3
  - 2.Qd5#
- 1...Bd4
  - 2.Rxd4#
- 1...Bd6
  - 2.Rd4#
  - 2.Qd5#
- 1...Bf6
  - 2.Qd5#
- 1...Bg7
  - 2.Qd5#
- 1...Bh8
  - 2.Qd5#
- 1...Sg4
  - 2.Qxh7#
- 1...Sf5
  - 2.Qf3#
- 1...Sf7
  - 2.Qxh7#
- 1...Sg8
  - 2.Qxh7#
- 1...cxb3
  - 2.f3#
- 1...c3
  - 2.f3#
- 1...f3
  - 2.Qxf3#
Tries
- 1.Bxc4?
  - threat
    - 2.Sd2#
    - 2.f3#
  - 1...f3
    - 2.Qxf3#
  - 1...Rb6
    - 2.f3#
  - 1...Bc3
    - 2.Qd5#
    - 2.f3#
  - 1...Rxc4!
- 1.Bb7?
  - threat
    - 2.Sc5#
  - 1...Kxd3
    - 2.Qf3#
  - 1...cxd3
    - 2.Bxc6#
  - 1...f3
    - 2.Qxf3#
  - 1...Bd4
    - 2.Rxd4#
  - 1...Bd6
    - 2.Rd4#
    - 2.Qd5#
  - 1...cxb3!
- 1.Re3+?
  - 1...Kd5
    - 2.Qxe5#
  - 1...fxe3!
- 1.Qh1+?
  - 1...Kxd3
    - 2.Qf3#
  - 1...f3
    - 2.Qxf3#
  - 1...Kf5!
Keys
- 1.Bb5!
  - 1...Kxd3
    - 2.Qf3#
  - 1...Rxe6
    - 2.Sc5#
  - 1...cxb3
    - 2.f3#
  - 1...cxd3
    - 2.Bxc6#
  - 1...f3
    - 2.Qxf3#
  - 1...Rc5
    - 2.Sxc5#
  - 1...Ra6
    - 2.Sc5#
  - 1...Rb6
    - 2.Sc5#
  - 1...Rd6
    - 2.Sc5#
  - 1...Ba1
    - 2.Qd5#
  - 1...Bb2
    - 2.Qd5#
  - 1...Bc3
    - 2.Qd5#
  - 1...Bd4
    - 2.Rxd4#
  - 1...Bd6
    - 2.Rd4#
    - 2.Qd5#
  - 1...Bf6
    - 2.Qd5#
  - 1...Bg7
    - 2.Qd5#
  - 1...Bh8
    - 2.Qd5#
  - 1...Sg4
    - 2.Qxh7#
  - 1...Sf5
    - 2.Qf3#
  - 1...Sf7
    - 2.Qxh7#
  - 1...Sg8
    - 2.Qxh7#
  - 1...c3
    - 2.f3#

FEATURES

Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 0
Sets
- K(b);P_SPINP(a),S_FLIGHT,XR(D)::QAR2(E)
- R(e);N_GUARD::S(C),XR(e)
- R(e);N_GUARD,XB(F)::S(C)
- R(e);N_GUARD::S(C)
- R(e);N_GUARD,XP(G)::S(C)
- B(d);OGATE::QAB1(E)
- B(d);N_GUARD::R1(D),XB(d)
- S(f);OGATE::QAB(E),XP(h)
- S(f);SBLOCK::QAB1(E)
- P(a);XS(C)::P(B)
- P(a);::P(B)
- P(c);::QAB1(E),XP(c)
Tries
- Try
  - B(F);XP(a)
  - Threat
    - DUALS(2)
  - Vars
    - P(c);::QAB1(E),XP(c)
    - R(e);P_PINS(C)::P(B)
  - Refutation
    - R(e);XB(F)
- Try
  - B(F);P_PINR(e)
  - Threat
    - S(C)
  - Vars
    - K(b);N_SPINR(e),S_FLIGHT,XR(D)::QAR2(E)
    - P(a);SBLOCK,XR(D)::B(F),XR(e)
    - P(c);::QAB1(E),XP(c)
    - B(d);N_GUARD::R1(D),XB(d)
  - Refutation
    - P(a);XS(C)
- Try
  - R(D);CHECK
  - Vars
    - K(b);P_SPINB(d),S_FLIGHT::QAR1(E),XB(d)
  - Refutation
    - P(c);XR(D)
- Try
  - Q(E);CHECK
  - Vars
    - K(b);P_SPINP(a),S_FLIGHT,XR(D)::QAR2(E)
    - P(c);P_SPINP(c)::QAB1(E),XP(c)
  - Refutation
    - K(b);S_FLIGHT
Actual
- B(F);
- Vars
  - K(b);P_SPINP(a),S_FLIGHT,XR(D)::QAR2(E)
  - R(e);N_GUARD,XP(G)::S(C)
  - P(a);XS(C)::P(B)
  - P(a);SBLOCK,XR(D)::B(F),XR(e)
  - P(c);::QAB1(E),XP(c)
  - R(e);N_GUARD::S(C),XR(e)
  - R(e);N_GUARD::S(C)
  - B(d);OGATE::QAB1(E)
  - B(d);N_GUARD::R1(D),XB(d)
  - S(f);OGATE::QAB(E),XP(h)
  - S(f);SBLOCK::QAB1(E)
  - P(a);::P(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).