MESON Chess Problem Database
Problem Display
PID: 254488 (4N3/1n5n/1Q1pBp1P/2rPpPp1/2P1k1p1/2P3P1/1p2K2P/8 w - - 0 1)
Fraenkel, Febus Hirsch
Die Schwalbe, 1930
#2
11 + 10
SOLUTION
- SOUND
- Sets
- 1...Rxc4
- 2.Qe3#
- 1...Ra5
- 2.Qe3#
- 1...Rb5
- 2.Qe3#
- 1...Rxd5
- 2.Qe3#
- 1...Rc6
- 2.Qe3#
- 1...Rc7
- 2.Qe3#
- 1...Rc8
- 2.Qe3#
- 1...Sa5
- 2.Sxd6#
- 1...Sd8
- 2.Sxd6#
- 1...Sf8
- 2.Sxf6#
- 1...b1Q
- 2.Qxb1#
- 1...b1S
- 2.Qxb1#
- 1...b1B
- 2.Qxb1#
- 1...b1R
- 2.Qxb1#
- 1...Rxc4
- Tries
- 1.Bd7?
- 1...Rxd5
- 2.Qe3#
- 1...b1Q
- 2.Qxb1#
- 1...b1S
- 2.Qxb1#
- 1...b1B
- 2.Qxb1#
- 1...b1R
- 2.Qxb1#
- 1...Sa5
- 2.Sxd6#
- 1...Ra5
- 2.Qe3#
- 1...Rb5
- 2.Qe3#
- 1...Rc6
- 2.Qe3#
- 1...Rc7
- 2.Qe3#
- 1...Rc8
- 2.Qe3#
- 1...Sd8
- 2.Sxd6#
- 1...Sf8
- 2.Sxf6#
- 1...Rxc4!
- 1...Rxd5
- 1.Qxc5?
- threat
- 2.Qe3#
- 1...Sxc5
- 2.Sxd6#
- 1...dxc5!
- threat
- 1.Qxb2?
- threat
- 2.Qb1#
- 2.Qc2#
- 1...Rb5
- 2.Qc2#
- 1...Rxd5!
- threat
- 1.Qb3?
- threat
- 2.Qc2#
- 1...b1Q
- 2.Qxb1#
- 1...b1B
- 2.Qxb1#
- 1...Rxd5!
- threat
- 1.h3?
- 1...Rxc4
- 2.Qe3#
- 1...Rxd5
- 2.Qe3#
- 1...b1Q
- 2.Qxb1#
- 1...b1S
- 2.Qxb1#
- 1...b1B
- 2.Qxb1#
- 1...b1R
- 2.Qxb1#
- 1...Ra5
- 2.Qe3#
- 1...Rb5
- 2.Qe3#
- 1...Rc6
- 2.Qe3#
- 1...Rc7
- 2.Qe3#
- 1...Rc8
- 2.Qe3#
- 1...Sa5
- 2.Sxd6#
- 1...Sd8
- 2.Sxd6#
- 1...Sf8
- 2.Sxf6#
- 1...gxh3!
- 1...Rxc4
- 1.Bd7?
- Keys
- 1.Qb4!
- 1...Rxc4
- 2.Qxc4#
- 1...Rxd5
- 2.cxd5#
- 1...b1Q
- 2.Qxb1#
- 1...b1S
- 2.Qxb1#
- 1...b1B
- 2.Qxb1#
- 1...b1R
- 2.Qxb1#
- 1...Sa5
- 2.Sxd6#
- 1...Ra5
- 2.c5#
- 1...Rb5
- 2.cxb5#
- 1...Rc6
- 2.c5#
- 1...Rc7
- 2.c5#
- 1...Rc8
- 2.c5#
- 1...Sd8
- 2.Sxd6#
- 1...Sf8
- 2.Sxf6#
- 1...Rxc4
- 1.Qb4!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 7
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- R(d);OGATE,XP(E)::QAR1(H)
- R(d);OGATE::QAR1(H)
- R(d);OGATE,XP(F)::QAR1(H)
- S(i);N_GUARD::S(K),XP(g)
- S(j);N_GUARD::S(K),XP(h)
- P(a);OGATE::QAB(H),XQ(a)
- P(a);OGATE::QAB(H),XS(a)
- P(a);OGATE::QAB(H),XB(a)
- P(a);OGATE::QAB(H),XR(a)
- Tries
- Try
- B(I);
- Vars
- R(d);OGATE,XP(F)::QAR1(H)
- P(a);OGATE::QAB(H),XQ(a)
- P(a);OGATE::QAB(H),XS(a)
- P(a);OGATE::QAB(H),XB(a)
- P(a);OGATE::QAB(H),XR(a)
- S(i);N_GUARD::S(K),XP(g)
- R(d);OGATE::QAR1(H)
- S(j);N_GUARD::S(K),XP(h)
- Refutation
- R(d);XP(E)
- Try
- Q(H);XR(d)
- Threat
- QAR1(H)
- Vars
- S(i);N_GUARD,XQ(H)::S(K),XP(g)
- Refutation
- P(g);XQ(H)
- Try
- Q(H);XP(a)
- Threat
- DUALS(2)
- Vars
- R(d);::QAB(H)
- Refutation
- R(d);XP(F)
- Try
- Q(H);
- Threat
- QAB(H)
- Vars
- P(a);OGATE::QAB(H),XQ(a)
- P(a);OGATE::QAB(H),XB(a)
- Refutation
- R(d);XP(F)
- Try
- P(B);
- Vars
- R(d);OGATE,XP(E)::QAR1(H)
- R(d);OGATE,XP(F)::QAR1(H)
- P(a);OGATE::QAB(H),XQ(a)
- P(a);OGATE::QAB(H),XS(a)
- P(a);OGATE::QAB(H),XB(a)
- P(a);OGATE::QAB(H),XR(a)
- R(d);OGATE::QAR1(H)
- S(i);N_GUARD::S(K),XP(g)
- S(j);N_GUARD::S(K),XP(h)
- Refutation
- P(c);XP(B)
- Try
- Actual
- Q(H);
- Vars
- R(d);OGATE,P_SPINR(d),XP(E)::QAR2(H),XR(d)
- R(d);OGATE,XP(F)::QAR(H)+P(E),XR(d)
- P(a);OGATE::QAB(H),XQ(a)
- P(a);OGATE::QAB(H),XS(a)
- P(a);OGATE::QAB(H),XB(a)
- P(a);OGATE::QAB(H),XR(a)
- S(i);N_GUARD::S(K),XP(g)
- R(d);OGATE::QAR(H)+P(E)
- R(d);OGATE::QAR(H)+P(E),XR(d)
- S(j);N_GUARD::S(K),XP(h)
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).