MESON Chess Problem Database
Problem Display
PID: 185083 (8/1n1Rp3/N2bP3/pn2Qpp1/2R1b2p/1P1k3p/4N2K/2BB4 w - - 0 1)
Stewart, John
The Observer, 1930
(First published on Sun Apr 20 1930)
#2
10 + 11
| 15239 | Valois Notebooks | 2018 |
SOLUTION
- SOUND
- Sets
- 1...Bh1
- 2.Bc2#
- 1...Bg2
- 2.Bc2#
- 1...Bf3
- 2.Bc2#
- 1...Bd5
- 2.Bc2#
- 1...Bc6
- 2.Bc2#
- 1...Sa3
- 2.Rc3#
- 2.Rd4#
- 1...Sc3
- 2.Rxc3#
- 2.Rd4#
- 1...Sd4
- 2.Rc3#
- 2.Rxd4#
- 1...Sa7
- 2.Rc3#
- 2.Rd4#
- 1...Sc7
- 2.Rc3#
- 2.Rd4#
- 1...Sc5
- 2.Sxc5#
- 1...Sd8
- 2.Sc5#
- 1...a4
- 2.Sb4#
- 1...f4
- 2.Qxe4#
- 1...g4
- 2.Sf4#
- 1...Bh1
- Tries
- 1.Kg1?
- 1...Bh1
- 2.Bc2#
- 2.Qe3#
- 1...Bg2
- 2.Bc2#
- 2.Qe3#
- 1...Bf3
- 2.Bc2#
- 2.Qe3#
- 1...Bd5
- 2.Bc2#
- 2.Qe3#
- 1...Bc6
- 2.Bc2#
- 2.Qe3#
- 1...Sa3
- 2.Rc3#
- 2.Rd4#
- 2.Qc3#
- 2.Qd4#
- 1...Sc3
- 2.Rxc3#
- 2.Rd4#
- 2.Qxc3#
- 2.Qd4#
- 1...Sd4
- 2.Rc3#
- 2.Rxd4#
- 2.Qxd4#
- 1...Sa7
- 2.Rc3#
- 2.Rd4#
- 2.Qc3#
- 2.Qd4#
- 1...Sc7
- 2.Rc3#
- 2.Rd4#
- 2.Qc3#
- 2.Qd4#
- 1...Sc5
- 2.Sxc5#
- 1...Sd8
- 2.Sc5#
- 1...a4
- 2.Sb4#
- 1...f4
- 2.Qxe4#
- 1...g4
- 2.Sf4#
- 1...h2+!
- 1...Bh1
- 1.Sg1?
- threat
- 2.Bc2#
- 2.Be2#
- 1...Bf3
- 2.Bc2#
- 1...Sa3
- 2.Be2#
- 2.Rc3#
- 1...Sc3
- 2.Rxc3#
- 2.Rd4#
- 1...Sd4!
- threat
- 1.Sg3?
- threat
- 2.Bc2#
- 2.Be2#
- 1...Bf3
- 2.Bc2#
- 2.Qe3#
- 1...Sa3
- 2.Be2#
- 2.Rc3#
- 2.Qc3#
- 2.Qd4#
- 1...Sc3
- 2.Rxc3#
- 2.Rd4#
- 2.Qxc3#
- 2.Qd4#
- 1...Sd4
- 2.Qxd4#
- 1...hxg3+!
- threat
- 1.Rc6?
- 1...Sc5
- 2.Sxc5#
- 1...Bh1
- 2.Bc2#
- 1...Bg2
- 2.Bc2#
- 1...Bf3
- 2.Bc2#
- 1...Bd5
- 2.Bc2#
- 1...Sa3
- 2.Rc3#
- 1...Sc3
- 2.Rxc3#
- 1...Sd4
- 2.Rc3#
- 1...Sa7
- 2.Rc3#
- 1...Sc7
- 2.Rc3#
- 1...Sd8
- 2.Sc5#
- 1...a4
- 2.Sb4#
- 1...f4
- 2.Qxb5#
- 1...g4
- 2.Sf4#
- 1...Bxc6!
- 1...Sc5
- 1.Rxd6+?
- 1...Bd5
- 2.Bc2#
- 2.Qe3#
- 2.Qxf5#
- 1...Sd4
- 2.Rc3#
- 2.Rcxd4#
- 2.Rdxd4#
- 2.Qxd4#
- 1...S5xd6
- 2.Rc3#
- 2.Rd4#
- 2.Qc3#
- 2.Qd4#
- 1...S7xd6
- 2.Sc5#
- 1...exd6!
- 1...Bd5
- 1.Rd8?
- 1...Sc5
- 2.Sxc5#
- 1...Bh1
- 2.Bc2#
- 1...Bg2
- 2.Bc2#
- 1...Bf3
- 2.Bc2#
- 1...Bd5
- 2.Bc2#
- 1...Bc6
- 2.Bc2#
- 1...Sa3
- 2.Rc3#
- 2.Rd4#
- 1...Sc3
- 2.Rxc3#
- 2.Rd4#
- 1...Sd4
- 2.Rc3#
- 2.Rxd4#
- 1...Sa7
- 2.Rc3#
- 2.Rd4#
- 1...Sc7
- 2.Rc3#
- 2.Rd4#
- 1...a4
- 2.Sb4#
- 1...f4
- 2.Qxe4#
- 1...g4
- 2.Sf4#
- 1...Sxd8!
- 1...Sc5
- 1.Kg1?
- Keys
- 1.Rc2!
- 1...Sc5
- 2.Sxc5#
- 1...Bh1
- 2.Rd2#
- 1...Bg2
- 2.Rd2#
- 1...Bf3
- 2.Rd2#
- 1...Bd5
- 2.Rd2#
- 1...Bc6
- 2.Rd2#
- 1...Sa3
- 2.Rc3#
- 1...Sc3
- 2.Rxc3#
- 1...Sd4
- 2.Rc3#
- 1...Sa7
- 2.Rc3#
- 1...Sc7
- 2.Rc3#
- 1...Sd8
- 2.Sc5#
- 1...a4
- 2.Sb4#
- 1...f4
- 2.Qxb5#
- 1...g4
- 2.Sf4#
- 1...Sc5
- 1.Rc2!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 6
- ADDED MATES = 5
- REMOVED MATES = 0
- Sets
- B(c);::B(B)
- B(c);N_SPINB(i)::B(B)
- S(j);N_GUARD::S(H),XS(j)
- S(j);N_GUARD::S(H)
- P(e);N_GUARD::S(H)
- P(g);N_PINQ(G)::QAB1(G),XB(c)
- P(h);N_GUARD::S(C)
- Tries
- Try
- K(D);N_SPINQ(G),S_FLIGHT
- Vars
- S(j);N_GUARD::S(H),XS(j)
- S(j);N_GUARD::S(H)
- P(e);N_GUARD::S(H)
- P(g);N_GUARD::QAB1(G),XB(c)
- P(h);N_GUARD::S(C)
- Refutation
- P(b);CHECK
- Try
- S(C);
- Threat
- DUALS(2)
- Vars
- B(c);::B(B)
- Refutation
- S(f);N_SPINB(i)
- Try
- S(C);N_SPINQ(G)
- Threat
- DUALS(2)
- Vars
- S(f);N_GUARD,N_SPINB(i)::QAR1(G),XS(f)
- Refutation
- P(d);CHECK,XS(C)
- Try
- R(F);
- Vars
- S(j);N_GUARD::S(H),XS(j)
- B(c);::B(B)
- B(c);N_SPINB(i)::B(B)
- S(f);N_GUARD::R1(F)
- S(f);N_GUARD::R1(F),XS(f)
- S(f);N_GUARD,N_SPINB(i)::R1(F)
- S(j);N_GUARD::S(H)
- P(e);N_GUARD::S(H)
- P(g);N_PINQ(G)::QAB(G),XS(f)
- P(h);N_GUARD::S(C)
- Refutation
- B(c);XR(F)
- Try
- R(J);CHECK,N_SPINQ(G),XB(i)
- Vars
- S(j);XR(J)::S(H)
- Refutation
- P(k);XR(J)
- Try
- R(J);
- Vars
- S(j);N_GUARD::S(H),XS(j)
- B(c);::B(B)
- B(c);N_SPINB(i)::B(B)
- P(e);N_GUARD::S(H)
- P(g);N_PINQ(G)::QAB1(G),XB(c)
- P(h);N_GUARD::S(C)
- Refutation
- S(j);N_SPINB(i),XR(J)
- Try
- Actual
- R(F);
- Vars
- S(j);N_GUARD::S(H),XS(j)
- B(c);::R1(F)
- B(c);N_SPINB(i)::R1(F)
- S(f);N_GUARD::R1(F)
- S(f);N_GUARD::R1(F),XS(f)
- S(f);N_GUARD,N_SPINB(i)::R1(F)
- S(j);N_GUARD::S(H)
- P(e);N_GUARD::S(H)
- P(g);N_PINQ(G)::QAB(G),XS(f)
- P(h);N_GUARD::S(C)
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).