MESON Chess Problem Database
Problem Display
PID: 92278 (4RB2/5P2/2N5/pP1k4/2np2p1/3P1b2/4nQP1/K7 w - - 0 1)
Letzin, Gustav
1st Prize, Arbeiter Schach Internationale, 1925
#2
9 + 7
| 6490 | yacpdb | 2009 |
SOLUTION
- SOUND
- Sets
- 1...Bxg2
- 2.Qxg2#
- 1...Be4
- 2.dxe4#
- 1...Sc1
- 2.Qxd4#
- 1...Sg1
- 2.Qxd4#
- 1...Sc3
- 2.Qxd4#
- 1...Sg3
- 2.Qxd4#
- 1...Sf4
- 2.Qxd4#
- 1...Sb2
- 2.Re5#
- 1...Sd2
- 2.Re5#
- 1...Sa3
- 2.Re5#
- 1...Se3
- 2.Re5#
- 1...Se5
- 2.Rxe5#
- 1...Sb6
- 2.Re5#
- 1...Sd6
- 2.Re5#
- 1...g3
- 2.Qxf3#
- 1...a4
- 2.Sb4#
- 1...Bxg2
- Tries
- 1.Qe3?
- threat
- 2.Qe6#
- 1...Sxe3
- 2.Re5#
- 1...Sd6
- 2.Re5#
- 2.Qe5#
- 1...Be4
- 2.Qxe4#
- 2.dxe4#
- 1...Sf4
- 2.Qxd4#
- 1...Se5
- 2.Rxe5#
- 2.Qxe5#
- 1...dxe3!
- threat
- 1.Qxe2?
- threat
- 2.Qe6#
- 2.dxc4#
- 1...Sd6
- 2.Re5#
- 2.Qe5#
- 1...Be4
- 2.Qxe4#
- 2.dxc4#
- 2.dxe4#
- 1...Sb2
- 2.Re5#
- 2.Rd8#
- 2.Qe5#
- 2.Qe6#
- 1...Sd2
- 2.Re5#
- 2.Rd8#
- 2.Qe5#
- 2.Qe6#
- 1...Sa3
- 2.Re5#
- 2.Rd8#
- 2.Qe5#
- 2.Qe6#
- 1...Se3
- 2.Re5#
- 1...Se5
- 2.Rxe5#
- 2.Qxe5#
- 1...Sb6
- 2.Re5#
- 2.Qe5#
- 2.Qe6#
- 1...Bxe2!
- threat
- 1.gxf3?
- 1...gxf3
- 2.Qxf3#
- 1...Sd6
- 2.Re5#
- 1...Sc1
- 2.Qxd4#
- 1...Sg1
- 2.Qxd4#
- 1...Sc3
- 2.Qxd4#
- 1...Sg3
- 2.Qxd4#
- 1...Sf4
- 2.Qxd4#
- 1...Sb2
- 2.Re5#
- 1...Sd2
- 2.Re5#
- 1...Sa3
- 2.Re5#
- 1...Se3
- 2.Re5#
- 1...Se5
- 2.Rxe5#
- 1...Sb6
- 2.Re5#
- 1...a4
- 2.Sb4#
- 1...g3!
- 1...gxf3
- 1.g3?
- 1...Sxg3
- 2.Qxd4#
- 1...Sd6
- 2.Re5#
- 1...Sc1
- 2.Qxd4#
- 1...Bg2
- 2.Qxg2#
- 1...Be4
- 2.dxe4#
- 1...Sg1
- 2.Qxd4#
- 1...Sc3
- 2.Qxd4#
- 1...Sf4
- 2.Qxd4#
- 1...Sb2
- 2.Re5#
- 1...Sd2
- 2.Re5#
- 1...Sa3
- 2.Re5#
- 1...Se3
- 2.Re5#
- 1...Se5
- 2.Rxe5#
- 1...Sb6
- 2.Re5#
- 1...a4
- 2.Sb4#
- 1...Bh1!
- 1...Sxg3
- 1.Qe3?
- Keys
- 1.Qf1!
- 1...Bxg2
- 2.Qxg2#
- 1...Sd6
- 2.Re5#
- 1...Sc1
- 2.dxc4#
- 1...Be4
- 2.dxe4#
- 1...Sg1
- 2.dxc4#
- 1...Sc3
- 2.dxc4#
- 1...Sg3
- 2.dxc4#
- 1...Sf4
- 2.dxc4#
- 1...Sb2
- 2.Re5#
- 1...Sd2
- 2.Re5#
- 1...Sa3
- 2.Re5#
- 1...Se3
- 2.Re5#
- 1...Se5
- 2.Rxe5#
- 1...Sb6
- 2.Re5#
- 1...g3
- 2.Qxf3#
- 1...a4
- 2.Sb4#
- 1...Bxg2
- 1.Qf1!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 5
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- B(b);OGATE,XP(C)::QAB(B),XB(b)
- B(b);OGATE::P(D),XB(b)
- S(a);N_GUARD::QAR1(B),XP(d)
- S(c);N_GUARD::R1(H)
- S(c);N_GUARD::R1(H),XS(c)
- P(e);N_GUARD::QAB(B),XB(b)
- P(f);N_GUARD::S(F)
- Tries
- Try
- Q(B);
- Threat
- QAB1(B)
- Vars
- S(c);N_GUARD,XQ(B)::R1(H)
- S(a);N_GUARD::QAR1(B),XP(d)
- Refutation
- P(d);XQ(B)
- Try
- Q(B);XS(a)
- Threat
- DUALS(2)
- Vars
- S(c);N_GUARD::R1(H)
- Refutation
- B(b);XQ(B)
- Try
- P(C);XB(b)
- Vars
- P(e);OGATE,XP(C)::QAB(B),XP(e)
- S(c);N_GUARD::R1(H)
- S(a);N_GUARD::QAR1(B),XP(d)
- S(c);N_GUARD::R1(H),XS(c)
- P(f);N_GUARD::S(F)
- Refutation
- P(e);
- Try
- P(C);
- Vars
- S(a);N_GUARD,XP(C)::QAR1(B),XP(d)
- S(c);N_GUARD::R1(H)
- S(a);N_GUARD::QAR1(B),XP(d)
- B(b);OGATEB::QAB(B),XB(b)
- B(b);OGATE::P(D),XB(b)
- S(c);N_GUARD::R1(H),XS(c)
- P(f);N_GUARD::S(F)
- Refutation
- B(b);
- Try
- Actual
- Q(B);
- Vars
- B(b);OGATE,XP(C)::QAB(B),XB(b)
- S(c);N_GUARD::R1(H)
- S(a);::P(D),XS(c)
- B(b);OGATE::P(D),XB(b)
- S(c);N_GUARD::R1(H),XS(c)
- P(e);N_GUARD::QAB(B),XB(b)
- P(f);N_GUARD::S(F)
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).