MESON Chess Problem Database
Problem Display
PID: 242302 (2B2rb1/rp5N/1R1B4/2pk1P2/4p3/1P2P1p1/1N2n1P1/5Q1K w - - 0 1)
Morra, Juan Carlos
Tijdschrift vd KNSB, 1952
#2
11 + 9
| 15148 | Sadier Collection | 2021 |
SOLUTION
- SOUND
- Sets
- 1...Ra1
- 2.Bxb7#
- 1...Ra2
- 2.Bxb7#
- 1...Ra3
- 2.Bxb7#
- 1...Ra4
- 2.Bxb7#
- 1...Ra5
- 2.Bxb7#
- 1...Ra6
- 2.Bxb7#
- 1...Ra8
- 2.Bxb7#
- 1...Rxf5
- 2.Qxf5#
- 1...Rf6
- 2.Sxf6#
- 1...Rf7
- 2.Be6#
- 1...Rxc8
- 2.Sf6#
- 1...Rd8
- 2.Sf6#
- 1...Re8
- 2.Sf6#
- 1...Be6
- 2.Bxe6#
- 1...Bf7
- 2.Sf6#
- 1...Bxh7
- 2.Be6#
- 1...Sc1
- 2.Qc4#
- 1...Sg1
- 2.Qc4#
- 2.Qd1#
- 1...Sc3
- 2.Qc4#
- 1...Sd4
- 2.Qc4#
- 1...Sf4
- 2.Qc4#
- 1...c4
- 2.bxc4#
- 1...Ra1
- Tries
- 1.Sd1?
- 1...Rxf5
- 2.Qxf5#
- 1...Rxc8
- 2.Sf6#
- 1...Bxh7
- 2.Be6#
- 1...Ra1
- 2.Bxb7#
- 1...Ra2
- 2.Bxb7#
- 1...Ra3
- 2.Bxb7#
- 1...Ra4
- 2.Bxb7#
- 1...Ra5
- 2.Bxb7#
- 1...Ra6
- 2.Bxb7#
- 1...Ra8
- 2.Bxb7#
- 1...Rf6
- 2.Sxf6#
- 1...Rf7
- 2.Be6#
- 1...Rd8
- 2.Sf6#
- 1...Re8
- 2.Sf6#
- 1...Be6
- 2.Bxe6#
- 1...Bf7
- 2.Sf6#
- 1...Sc1
- 2.Sc3#
- 2.Qc4#
- 1...Sg1
- 2.Sc3#
- 2.Qc4#
- 1...Sc3
- 2.Sxc3#
- 2.Qc4#
- 1...Sd4
- 2.Sc3#
- 2.Qc4#
- 1...Sf4
- 2.Sc3#
- 2.Qc4#
- 1...c4!
- 1...Rxf5
- 1.Sa4?
- 1...Rxa4
- 2.Bxb7#
- 1...Rxf5
- 2.Qxf5#
- 1...Rxc8
- 2.Sf6#
- 1...Bxh7
- 2.Be6#
- 1...Ra5
- 2.Bxb7#
- 1...Ra6
- 2.Bxb7#
- 1...Ra8
- 2.Bxb7#
- 1...Rf6
- 2.Sxf6#
- 1...Rf7
- 2.Be6#
- 1...Rd8
- 2.Sf6#
- 1...Re8
- 2.Sf6#
- 1...Be6
- 2.Bxe6#
- 1...Bf7
- 2.Sf6#
- 1...Sc1
- 2.Sc3#
- 2.Qc4#
- 1...Sg1
- 2.Sc3#
- 2.Qc4#
- 2.Qd1#
- 1...Sc3
- 2.Sxc3#
- 2.Qc4#
- 1...Sd4
- 2.Sc3#
- 2.Qc4#
- 1...Sf4
- 2.Sc3#
- 2.Qc4#
- 1...c4!
- 1...Rxa4
- 1.Sxf8?
- 1...c4
- 2.bxc4#
- 1...Ra1
- 2.Bxb7#
- 1...Ra2
- 2.Bxb7#
- 1...Ra3
- 2.Bxb7#
- 1...Ra4
- 2.Bxb7#
- 1...Ra5
- 2.Bxb7#
- 1...Ra6
- 2.Bxb7#
- 1...Ra8
- 2.Bxb7#
- 1...Be6
- 2.Bxe6#
- 1...Bh7
- 2.Be6#
- 1...Sc1
- 2.Qc4#
- 1...Sg1
- 2.Qc4#
- 2.Qd1#
- 1...Sc3
- 2.Qc4#
- 1...Sd4
- 2.Qc4#
- 1...Sf4
- 2.Qc4#
- 1...Bf7!
- 1...c4
- 1.Bc7?
- 1...Rxf5
- 2.Qxf5#
- 1...Rxc8
- 2.Sf6#
- 1...Bxh7
- 2.Be6#
- 1...Ra1
- 2.Bxb7#
- 1...Ra2
- 2.Bxb7#
- 1...Ra3
- 2.Bxb7#
- 1...Ra4
- 2.Bxb7#
- 1...Ra5
- 2.Bxb7#
- 1...Ra6
- 2.Bxb7#
- 1...Ra8
- 2.Bxb7#
- 1...Rf6
- 2.Sxf6#
- 1...Rf7
- 2.Be6#
- 1...Rd8
- 2.Sf6#
- 1...Re8
- 2.Sf6#
- 1...Be6
- 2.Bxe6#
- 1...Bf7
- 2.Sf6#
- 1...Sc1
- 2.Qc4#
- 1...Sg1
- 2.Qc4#
- 2.Qd1#
- 1...Sc3
- 2.Qc4#
- 1...Sd4
- 2.Qc4#
- 1...Sf4
- 2.Qc4#
- 1...c4!
- 1...Rxf5
- 1.Bb8?
- 1...Rxf5
- 2.Qxf5#
- 1...Rxc8
- 2.Sf6#
- 1...Bxh7
- 2.Be6#
- 1...Ra1
- 2.Bxb7#
- 1...Ra2
- 2.Bxb7#
- 1...Ra3
- 2.Bxb7#
- 1...Ra4
- 2.Bxb7#
- 1...Ra5
- 2.Bxb7#
- 1...Ra6
- 2.Bxb7#
- 1...Ra8
- 2.Bxb7#
- 1...Rf6
- 2.Sxf6#
- 1...Rf7
- 2.Be6#
- 1...Rd8
- 2.Sf6#
- 1...Re8
- 2.Sf6#
- 1...Be6
- 2.Bxe6#
- 1...Bf7
- 2.Sf6#
- 1...Sc1
- 2.Qc4#
- 1...Sg1
- 2.Qc4#
- 2.Qd1#
- 1...Sc3
- 2.Qc4#
- 1...Sd4
- 2.Qc4#
- 1...Sf4
- 2.Qc4#
- 1...c4!
- 1...Rxf5
- 1.Qxe2?
- threat
- 2.Qd1#
- 2.Qc4#
- 2.Qd2#
- 1...c4
- 2.Qd1#
- 2.Qxc4#
- 2.Qd2#
- 2.bxc4#
- 1...Ra4
- 2.Bxb7#
- 1...Ra1+!
- threat
- 1.Qc1?
- threat
- 2.Qc4#
- 2.Qxc5#
- 1...Rxc8
- 2.Sf6#
- 2.Qc4#
- 1...c4
- 2.Qxc4#
- 2.bxc4#
- 1...Ra1
- 2.Bxb7#
- 1...Ra4
- 2.Bxb7#
- 2.Qxc5#
- 1...Ra5
- 2.Bxb7#
- 2.Qc4#
- 1...Sc3
- 2.Qd2#
- 1...Sxc1!
- threat
- 1.Sd1?
- Keys
- 1.Sd3!
- 1...Rxf5
- 2.Qxf5#
- 1...Rxc8
- 2.Sf6#
- 1...Bxh7
- 2.Be6#
- 1...exd3
- 2.Qf3#
- 1...Ra1
- 2.Bxb7#
- 1...Ra2
- 2.Bxb7#
- 1...Ra3
- 2.Bxb7#
- 1...Ra4
- 2.Bxb7#
- 1...Ra5
- 2.Bxb7#
- 1...Ra6
- 2.Bxb7#
- 1...Ra8
- 2.Bxb7#
- 1...Rf6
- 2.Sxf6#
- 1...Rf7
- 2.Be6#
- 1...Rd8
- 2.Sf6#
- 1...Re8
- 2.Sf6#
- 1...Be6
- 2.Bxe6#
- 1...Bf7
- 2.Sf6#
- 1...Sc1
- 2.Sf4#
- 1...Sg1
- 2.Sf4#
- 1...Sc3
- 2.Sf4#
- 1...Sd4
- 2.Sf4#
- 1...Sf4
- 2.Sxf4#
- 1...c4
- 2.Sb4#
- 1...Rxf5
- 1.Sd3!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 5
- ADDED MATES = 2
- REMOVED MATES = 0
- Sets
- R(f);N_GUARD,P_PINQ(A)::B(K),XP(g)
- R(f);N_GUARD::B(K),XP(g)
- R(h);OGATE,XP(G)::QAR2(A),XR(h)
- R(h);N_GUARD::S(J),XR(h)
- R(h);S_CUTB(i)::B(K)
- R(h);N_GUARD,XB(K)::S(J)
- R(h);N_GUARD::S(J)
- B(i);N_GUARD::B(K),XB(i)
- B(i);S_CUTR(h)::S(J)
- B(i);N_GUARD,XS(J)::B(K)
- S(a);OGATE::QAB1(A)
- P(d);OGATE::P(E),XP(d)
- Tries
- Try
- S(C);
- Vars
- R(h);OGATE,XP(G)::QAR2(A),XR(h)
- R(h);N_GUARD,XB(K)::S(J)
- B(i);N_GUARD,XS(J)::B(K)
- R(f);N_GUARD::B(K),XP(g)
- R(h);N_GUARD::S(J),XR(h)
- R(h);S_CUTB(i)::B(K)
- R(h);N_GUARD::S(J)
- B(i);N_GUARD::B(K),XB(i)
- B(i);S_CUTR(h)::S(J)
- Refutation
- P(d);
- Try
- S(C);
- Vars
- R(f);N_GUARD,XS(C)::B(K),XP(g)
- R(h);OGATE,XP(G)::QAR2(A),XR(h)
- R(h);N_GUARD,XB(K)::S(J)
- B(i);N_GUARD,XS(J)::B(K)
- R(f);N_GUARD::B(K),XP(g)
- R(h);N_GUARD::S(J),XR(h)
- R(h);S_CUTB(i)::B(K)
- R(h);N_GUARD::S(J)
- B(i);N_GUARD::B(K),XB(i)
- B(i);S_CUTR(h)::S(J)
- Refutation
- P(d);
- Try
- S(J);XR(h)
- Vars
- P(d);OGATE::P(E),XP(d)
- R(f);N_GUARD,P_PINQ(A)::B(K),XP(g)
- R(f);N_GUARD::B(K),XP(g)
- B(i);N_GUARD::B(K),XB(i)
- B(i);N_GUARD::B(K)
- S(a);OGATE::QAB1(A)
- Refutation
- B(i);
- Try
- B(I);
- Vars
- R(h);OGATE,XP(G)::QAR2(A),XR(h)
- R(h);N_GUARD,XB(K)::S(J)
- B(i);N_GUARD,XS(J)::B(K)
- R(f);N_GUARD,P_PINQ(A)::B(K),XP(g)
- R(f);N_GUARD::B(K),XP(g)
- R(h);N_GUARD::S(J),XR(h)
- R(h);S_CUTB(i)::B(K)
- R(h);N_GUARD::S(J)
- B(i);N_GUARD::B(K),XB(i)
- B(i);S_CUTR(h)::S(J)
- S(a);OGATE::QAB1(A)
- Refutation
- P(d);
- Try
- B(I);
- Vars
- R(h);OGATE,XP(G)::QAR2(A),XR(h)
- R(h);N_GUARD,XB(K)::S(J)
- B(i);N_GUARD,XS(J)::B(K)
- R(f);N_GUARD,P_PINQ(A)::B(K),XP(g)
- R(f);N_GUARD::B(K),XP(g)
- R(h);N_GUARD::S(J),XR(h)
- R(h);S_CUTB(i)::B(K)
- R(h);N_GUARD::S(J)
- B(i);N_GUARD::B(K),XB(i)
- B(i);S_CUTR(h)::S(J)
- S(a);OGATE::QAB1(A)
- Refutation
- P(d);
- Try
- Q(A);XS(a)
- Threat
- DUALS(3)
- Vars
- R(f);N_GUARD::B(K),XP(g)
- Refutation
- R(f);CHECK
- Try
- Q(A);
- Threat
- DUALS(2)
- Vars
- R(f);N_GUARD,P_PINQ(A)::B(K),XP(g)
- S(a);N_GUARD::QAR(A)
- Refutation
- S(a);XQ(A)
- Try
- Actual
- S(C);
- Vars
- R(h);OGATE,XP(G)::QAR2(A),XR(h)
- R(h);N_GUARD,XB(K)::S(J)
- B(i);N_GUARD,XS(J)::B(K)
- P(c);OGATEB,XS(C)::QAB(A)
- R(f);N_GUARD,P_PINQ(A)::B(K),XP(g)
- R(f);N_GUARD::B(K),XP(g)
- R(h);N_GUARD::S(J),XR(h)
- R(h);S_CUTB(i)::B(K)
- R(h);N_GUARD::S(J)
- B(i);N_GUARD::B(K),XB(i)
- B(i);S_CUTR(h)::S(J)
- S(a);N_GUARD::S(C)
- S(a);N_GUARD::S(C),XS(a)
- P(d);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).