MESON Chess Problem Database
Problem Display
PID: 242355 (1nNN4/2Rp4/1B6/rp1k4/p4P2/P3pK2/3bQn2/8 w - - 0 1)
Morra, Juan Carlos
Arbejder-Skak, 1959
#2
8 + 9
| 15148 | Sadier Collection | 2021 |
SOLUTION
- SOUND
- Sets
- 1...Ra6
- 2.Qxb5#
- 1...Ra7
- 2.Qxb5#
- 1...Ra8
- 2.Qxb5#
- 1...Bc1
- 2.Qa2#
- 1...Be1
- 2.Qa2#
- 1...Bc3
- 2.Qa2#
- 1...Bb4
- 2.Qa2#
- 1...Sd1
- 2.Qd3#
- 1...Sh1
- 2.Qd3#
- 1...Sd3
- 2.Qxd3#
- 1...Sh3
- 2.Qd3#
- 1...Se4
- 2.Qd3#
- 1...Sg4
- 2.Qd3#
- 1...Sa6
- 2.Rxd7#
- 1...Sc6
- 2.Rxd7#
- 1...b4
- 2.Qc4#
- 1...d6
- 2.Se7#
- 1...Ra6
- Tries
- 1.Bxe3?
- threat
- 2.Rc5#
- 1...Bb4
- 2.Qa2#
- 1...Sd3
- 2.Qxd3#
- 1...Se4
- 2.Qd3#
- 1...Sa6
- 2.Rxd7#
- 1...Sc6
- 2.Rxd7#
- 1...b4
- 2.Qc4#
- 1...d6
- 2.Sb6#
- 2.Se7#
- 1...Bxe3!
- threat
- 1.Bc5?
- threat
- 2.Sb6#
- 2.Se7#
- 1...Sd3
- 2.Sb6#
- 2.Qxd3#
- 1...Ra6
- 2.Se7#
- 1...Sc6!
- threat
- 1.Ba7?
- 1...Ra6
- 2.Qxb5#
- 1...Bc1
- 2.Qa2#
- 1...Be1
- 2.Qa2#
- 1...Bc3
- 2.Qa2#
- 1...Bb4
- 2.Qa2#
- 1...Sd1
- 2.Qd3#
- 1...Sh1
- 2.Qd3#
- 1...Sd3
- 2.Qxd3#
- 1...Sh3
- 2.Qd3#
- 1...Se4
- 2.Qd3#
- 1...Sg4
- 2.Qd3#
- 1...Sa6
- 2.Rxd7#
- 1...Sc6
- 2.Rxd7#
- 1...b4
- 2.Qc4#
- 1...d6
- 2.Se7#
- 1...Rxa7!
- 1...Ra6
- 1.Rb7?
- 1...Sd3
- 2.Qxd3#
- 1...Ra6
- 2.Qxb5#
- 1...Ra7
- 2.Qxb5#
- 1...Ra8
- 2.Qxb5#
- 1...Bc1
- 2.Qa2#
- 1...Be1
- 2.Qa2#
- 1...Bc3
- 2.Qa2#
- 1...Bb4
- 2.Qa2#
- 1...Sd1
- 2.Qd3#
- 1...Sh1
- 2.Qd3#
- 1...Sh3
- 2.Qd3#
- 1...Se4
- 2.Qd3#
- 1...Sg4
- 2.Qd3#
- 1...Sa6
- 2.Rxd7#
- 1...Sc6
- 2.Rxd7#
- 1...d6
- 2.Se7#
- 1...b4!
- 1...Sd3
- 1.Qxd2+?
- 1...Sd3
- 2.Qa2#
- 2.Qxd3#
- 1...exd2!
- 1...Sd3
- 1.Qxe3?
- threat
- 2.Rc5#
- 2.Qd4#
- 2.Qc5#
- 2.Qe5#
- 1...Sc6
- 2.Qc5#
- 1...Bc3
- 2.Rc5#
- 2.Qc5#
- 1...Bb4
- 2.Qd4#
- 2.Qe5#
- 1...Sd3
- 2.Qd4#
- 2.Qxd3#
- 2.Qe4#
- 1...Se4
- 2.Qd4#
- 2.Qd3#
- 2.Qxe4#
- 1...Sg4
- 2.Rc5#
- 2.Qxd2#
- 2.Qd4#
- 2.Qc5#
- 2.Qd3#
- 2.Qe4#
- 1...Sa6
- 2.Qd4#
- 2.Qe5#
- 1...b4
- 2.Qd4#
- 2.Qe5#
- 1...d6
- 2.Se7#
- 2.Qd4#
- 2.Qe6#
- 1...Bxe3!
- threat
- 1.Bxe3?
- Keys
- 1.Ra7!
- 1...Rxa7
- 2.Qxb5#
- 1...Sd3
- 2.Qxd3#
- 1...Ra6
- 2.Qxb5#
- 1...Bc1
- 2.Qa2#
- 1...Be1
- 2.Qa2#
- 1...Bc3
- 2.Qa2#
- 1...Bb4
- 2.Qa2#
- 1...Sd1
- 2.Qd3#
- 1...Sh1
- 2.Qd3#
- 1...Sh3
- 2.Qd3#
- 1...Se4
- 2.Qd3#
- 1...Sg4
- 2.Qd3#
- 1...Sa6
- 2.Rxd7#
- 1...Sc6
- 2.Rxd7#
- 1...b4
- 2.Rxa5#
- 1...d6
- 2.Se7#
- 1...Rxa7
- 1.Ra7!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 1
- ADDED MATES = 0
- REMOVED MATES = 1
- Sets
- R(e);N_GUARD::QAR2(A),XP(f)
- B(a);OGATE::QAB(A)
- S(b);N_GUARD::QAR2(A)
- S(b);N_GUARD::QAR2(A),XS(b)
- S(i);N_GUARD::R(F),XP(h)
- P(f);N_GUARD::QAB1(A)
- P(h);SBLOCK::S(G)
- Tries
- Try
- B(E);XP(c)
- Threat
- R1(F)
- Vars
- B(a);OGATE::QAB(A)
- S(b);N_GUARD::QAR2(A),XS(b)
- S(b);N_GUARD::QAR2(A)
- S(i);N_GUARD::R(F),XP(h)
- P(f);N_GUARD::QAB1(A)
- Refutation
- B(a);XB(E)
- Try
- B(E);
- Threat
- DUALS(2)
- Vars
- R(e);::S(G)
- Refutation
- S(i);
- Try
- B(E);
- Vars
- R(e);N_GUARD::QAR2(A),XP(f)
- B(a);OGATE::QAB(A)
- S(b);N_GUARD::QAR2(A)
- S(b);N_GUARD::QAR2(A),XS(b)
- S(i);N_GUARD::R(F),XP(h)
- P(f);N_GUARD::QAB1(A)
- P(h);SBLOCK::S(G)
- Refutation
- R(e);XB(E)
- Try
- R(F);
- Vars
- S(b);N_GUARD::QAR2(A),XS(b)
- R(e);N_GUARD::QAR2(A),XP(f)
- B(a);OGATE::QAB(A)
- S(b);N_GUARD::QAR2(A)
- S(i);N_GUARD::R(F),XP(h)
- P(h);SBLOCK::S(G)
- Refutation
- P(f);
- Try
- Q(A);CHECK,XB(a)
- Refutation
- P(c);XQ(A)
- Try
- Q(A);XP(c)
- Threat
- DUALS(4)
- Vars
- S(i);::QAR1(A)
- Refutation
- B(a);XQ(A)
- Try
- Actual
- R(F);
- Vars
- R(e);N_GUARD,XR(F)::QAR2(A),XP(f)
- S(b);N_GUARD::QAR2(A),XS(b)
- R(e);N_GUARD::QAR2(A),XP(f)
- B(a);OGATE::QAB(A)
- S(b);N_GUARD::QAR2(A)
- S(i);N_GUARD::R(F),XP(h)
- P(f);OGATEB::R(F),XR(e)
- P(h);SBLOCK::S(G)
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).