MESON Chess Problem Database
Problem Display
PID: 101080 (5n1q/4B3/b4RP1/4k1rp/r5p1/n1PQp1P1/B2NKN2/8 w - - 0 1)
Malmstrom, Birger Georg Christens
Good Companions, 1921
#2
10 + 10
| 6490 | yacpdb | 2009 |
SOLUTION
- SOUND
- Sets
- 1...Rc4
- 2.Qd6#
- 1...Rd4
- 2.cxd4#
- 1...Rf4
- 2.gxf4#
- 1...Rf5
- 2.Rxf5#
- 1...Rxg6
- 2.Rf5#
- 1...Bxd3+
- 2.Sxd3#
- 1...Bb7
- 2.Qd6#
- 1...Bc8
- 2.Qd5#
- 2.Qd6#
- 1...Sc4
- 2.Qe4#
- 2.Qd4#
- 1...Sb5
- 2.Qd5#
- 1...Se6
- 2.Rxe6#
- 1...Sxg6
- 2.Re6#
- 1...Sd7
- 2.Re6#
- 1...Sh7
- 2.Re6#
- 1...Rc4
- Tries
- 1.Kd1?
- threat
- 2.Qd5#
- 2.Qd6#
- 1...Qxf6
- 2.Qd5#
- 1...Bxd3
- 2.Sxd3#
- 1...Qg8
- 2.Qd6#
- 1...Rc4
- 2.Qd6#
- 1...Rd4
- 2.Qxd4#
- 2.cxd4#
- 1...Ra5
- 2.Qe4#
- 2.Qxe3#
- 2.Qd4#
- 2.Qd6#
- 1...Bc4
- 2.Qe4#
- 2.Qd4#
- 2.Qd6#
- 1...Bb7
- 2.Qd6#
- 1...Sc4
- 2.Qe4#
- 2.Qd4#
- 1...Sb5
- 2.Qd5#
- 1...e2+!
- threat
- 1.Sc4+?
- 1...Rxc4
- 2.Qd6#
- 1...Sxc4
- 2.Qe4#
- 2.Qd4#
- 1...Bxc4!
- 1...Rxc4
- 1.Sxg4+?
- 1...Raxg4
- 2.Sf3#
- 1...Rgxg4
- 2.Sf3#
- 2.Rf5#
- 1...hxg4!
- 1...Raxg4
- 1.Bc4?
- threat
- 2.Qe4#
- 2.Qxe3#
- 2.Qd4#
- 2.Qd5#
- 2.Qd6#
- 1...Qxf6
- 2.Qe4#
- 2.Qd5#
- 1...Rxc4
- 2.Qd6#
- 1...Sxc4
- 2.Qe4#
- 2.Qd4#
- 1...exd2
- 2.Qe4#
- 2.Qe3#
- 2.Qd4#
- 2.Qd5#
- 2.Qd6#
- 1...exf2
- 2.Qe4#
- 2.Qe3#
- 2.Qd4#
- 2.Qd5#
- 2.Qd6#
- 1...Qg8
- 2.Qe4#
- 2.Qxe3#
- 2.Qd4#
- 2.Qd6#
- 1...Ra5
- 2.Qe4#
- 2.Qxe3#
- 2.Qd4#
- 2.Qd6#
- 1...Bb7
- 2.Qd4#
- 2.Qd6#
- 1...Sc2
- 2.Qe4#
- 2.Qd5#
- 2.Qd6#
- 1...Sb5
- 2.Qe4#
- 2.Qxe3#
- 2.Qd5#
- 1...Se6
- 2.Rxe6#
- 2.Qe4#
- 2.Qxe3#
- 2.Qd5#
- 2.Qd6#
- 1...Bxc4!
- threat
- 1.Rxa6?
- threat
- 2.Qd5#
- 1...Qg8
- 2.Bf6#
- 1...Rd4
- 2.cxd4#
- 1...Ra5
- 2.Qe4#
- 1...Sc4
- 2.Qe4#
- 1...Rc4!
- threat
- 1.Rf7?
- threat
- 2.Bd6#
- 1...Bxd3+
- 2.Sxd3#
- 1...Rxg6
- 2.Rf5#
- 1...Rc4
- 2.Qd6#
- 1...Sc4
- 2.Qe4#
- 1...Qf6
- 2.Bxf6#
- 1...Rd4
- 2.cxd4#
- 1...Sb5
- 2.Qd5#
- 1...Bc4!
- threat
- 1.Qb5+?
- 1...Sxb5
- 2.Sd3#
- 1...Bxb5+!
- 1...Sxb5
- 1.Qxa6?
- threat
- 2.Sd3#
- 2.Qd6#
- 1...Qxf6
- 2.Qxf6#
- 1...Rxa6
- 2.Sd3#
- 1...exd2
- 2.Qd6#
- 1...exf2
- 2.Qd6#
- 1...Rc4
- 2.Qd6#
- 1...Sc4
- 2.Qb5#
- 1...Sb5
- 2.Sd3#
- 2.Qxb5#
- 1...Rd4!
- threat
- 1.c4?
- threat
- 2.Qe4#
- 2.Qc3#
- 2.Qxe3#
- 2.Qd5#
- 2.Qd6#
- 1...Qxf6
- 2.Qe4#
- 2.Qd5#
- 1...Rxc4
- 2.Qd6#
- 1...Sxc4
- 2.Qe4#
- 1...exd2
- 2.Qe4#
- 2.Qc3#
- 2.Qe3#
- 2.Qd5#
- 2.Qd6#
- 1...exf2
- 2.Qe4#
- 2.Qc3#
- 2.Qe3#
- 2.Qd5#
- 2.Qd6#
- 1...Qg8
- 2.Qe4#
- 2.Qc3#
- 2.Qxe3#
- 2.Qd6#
- 1...Ra5
- 2.Qe4#
- 2.Qc3#
- 2.Qxe3#
- 2.Qd6#
- 1...Bb7
- 2.Qc3#
- 2.Qd6#
- 1...Sb1
- 2.Qe4#
- 2.Qxe3#
- 2.Qd5#
- 2.Qd6#
- 1...Sc2
- 2.Qe4#
- 2.Qd5#
- 2.Qd6#
- 1...Sb5
- 2.Qe4#
- 2.Qxe3#
- 2.Qd5#
- 1...Se6
- 2.Qe4#
- 2.Qxe3#
- 2.Qd5#
- 2.Qd6#
- 1...Bxc4!
- threat
- 1.Kd1?
- Keys
- 1.Rf3!
- threat
- 2.Bd6#
- 1...Bxd3+
- 2.Sxd3#
- 1...gxf3+
- 2.Sxf3#
- 1...Rxg6
- 2.Rf5#
- 1...Rc4
- 2.Qd6#
- 1...Bc4
- 2.Rxe3#
- 1...Sc4
- 2.Qe4#
- 1...Qf6
- 2.Bxf6#
- 1...Rd4
- 2.cxd4#
- 1...Rf4
- 2.gxf4#
- 1...Rf5
- 2.Rxf5#
- 1...Sb5
- 2.Qd5#
- threat
- 1.Rf3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 5
- Sets
- R(c);N_PINQ(F)::QAB1(F)
- R(c);OGATE::P(E),XR(c)
- R(c);OGATE::P(G),XR(c)
- R(f);N_GUARD::R1(H),XR(f)
- R(f);N_GUARD,XP(I)::R1(H)
- B(h);CHECK,XQ(F)::S(D),XB(h)
- B(h);N_PINQ(F)::QAB1(F)
- S(a);N_PINQ(F)::QAR1(F)
- S(i);N_GUARD::R1(H),XS(i)
- S(i);N_GUARD,XP(I)::R1(H)
- S(i);N_GUARD::R1(H)
- Tries
- Try
- K(C);N_SPINQ(F),S_FLIGHT
- Threat
- DUALS(2)
- Vars
- Q(j);XR(H)::QAR1(F)
- B(h);XQ(F)::S(D),XB(h)
- Q(j);::QAB1(F)
- R(c);::QAB1(F)
- B(h);::QAB1(F)
- S(a);::QAR1(F)
- Refutation
- P(b);CHECK
- Try
- S(B);CHECK,N_SPINQ(F)
- Vars
- R(c);XS(B)::QAB1(F)
- Refutation
- B(h);P_PINQ(F),XS(B)
- Try
- S(D);CHECK,XP(d)
- Vars
- R(c);XS(D)::S(B)
- Refutation
- P(g);XS(D)
- Try
- B(A);N_SPINQ(F)
- Threat
- DUALS(5)
- Vars
- R(c);XB(A)::QAB1(F)
- Refutation
- B(h);P_PINQ(F),XB(A)
- Try
- R(H);N_SPINQ(F),XB(h)
- Threat
- QAR1(F)
- Vars
- Q(j);N_GUARD::B(J)
- R(c);OGATE::P(E),XR(c)
- R(c);N_GUARD::QAR1(F)
- S(a);S_CUTR(c)::QAR1(F)
- Refutation
- R(c);
- Try
- R(H);
- Threat
- B(J)
- Vars
- B(h);CHECK,XQ(F)::S(D),XB(h)
- R(f);N_GUARD,XP(I)::R1(H)
- R(c);N_PINQ(F)::QAB1(F)
- S(a);N_PINQ(F)::QAR1(F)
- Q(j);N_GUARD::B(J),XQ(j)
- R(c);OGATE::P(E),XR(c)
- Refutation
- B(h);
- Try
- Q(F);CHECK
- Vars
- S(a);XQ(F)::S(D)
- Refutation
- B(h);CHECK,XQ(F)
- Try
- Q(F);N_SPINQ(F),XB(h)
- Threat
- DUALS(2)
- Vars
- Q(j);OGATE,XR(H)::QAB1(F),XQ(j)
- R(c);XQ(F)::S(D)
- P(b);XS(B)::QAB1(F)
- P(b);XS(D)::QAB1(F)
- R(c);::QAB1(F)
- S(a);N_GUARD::QAR(F)
- Refutation
- R(c);
- Try
- P(E);N_SPINQ(F)
- Threat
- DUALS(5)
- Vars
- R(c);XP(E)::QAB1(F)
- S(a);XP(E)::QAR1(F)
- Refutation
- B(h);P_PINQ(F),XP(E)
- Try
- Actual
- R(H);
- Threat
- B(J)
- Vars
- B(h);CHECK,XQ(F)::S(D),XB(h)
- P(d);CHECK,XR(H)::S(B),XP(d)
- R(f);N_GUARD,XP(I)::R1(H)
- R(c);N_PINQ(F)::QAB1(F)
- B(h);S_CUTR(c)::R(H),XP(b)
- S(a);N_PINQ(F)::QAR1(F)
- Q(j);N_GUARD::B(J),XQ(j)
- R(c);OGATE::P(E),XR(c)
- R(c);OGATE::P(G),XR(c)
- R(f);N_GUARD::R1(H),XR(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).