MESON Chess Problem Database
Problem Display
PID: 72672 (5r2/2b5/1B6/7R/3pnk2/q2p2N1/3P1P2/2NB1QK1 w - - 0 1)
Laaksonen, Hellmuth
Ojanen, Antti Gottfried
Schackvarlden, 1942
#2
9 + 7
SOLUTION
- SOUND
- Sets
- 1...Qb2
- 2.Sxd3#
- 1...Qb4
- 2.Sxd3#
- 1...Qc5
- 2.Sxd3#
- 1...Qd6
- 2.Sxd3#
- 1...Qe7
- 2.Sxd3#
- 1...Qa1
- 2.Sxd3#
- 1...Qa2
- 2.Sxd3#
- 1...Qa4
- 2.Sxd3#
- 1...Qa5
- 2.Sxd3#
- 1...Qa7
- 2.Sxd3#
- 1...Qa8
- 2.Sxd3#
- 1...Rf5
- 2.Rxf5#
- 1...Ra8
- 2.Rf5#
- 1...Rb8
- 2.Rf5#
- 1...Rc8
- 2.Rf5#
- 1...Rd8
- 2.Rf5#
- 1...Re8
- 2.Rf5#
- 1...Rg8
- 2.Rf5#
- 1...Rh8
- 2.Rf5#
- 1...Sxf2
- 2.Qxf2#
- 1...Sc3
- 2.Sxd3#
- 1...Sc5
- 2.Bxc7#
- 1...Sf6
- 2.Rf5#
- 1...Qb2
- Tries
- 1.Sge2+?
- 1...Kf3
- 2.Qg2#
- 1...Kg4
- 2.Qh3#
- 1...dxe2!
- 1...Kf3
- 1.Bxd4?
- threat
- 2.Be3#
- 1...Sxf2
- 2.Qxf2#
- 1...Qc5
- 2.Sxd3#
- 1...Qa7
- 2.Sxd3#
- 1...Rf5
- 2.Rxf5#
- 1...Bb6
- 2.Be5#
- 1...Sg5
- 2.Rh4#
- 1...Sxg3!
- threat
- 1.Bxc7+?
- 1...Qd6
- 2.Sxd3#
- 1...Sd6!
- 1...Qd6
- 1.Qe2?
- threat
- 2.Qf3#
- 2.Qg4#
- 2.Qxe4#
- 1...Sxd2
- 2.Qg4#
- 2.Qxd2#
- 1...Sxf2
- 2.Qf3#
- 2.Qxf2#
- 1...Sxg3
- 2.Qf3#
- 2.Qg4#
- 1...Rf5
- 2.Rxf5#
- 2.Qxe4#
- 1...Qe7
- 2.Sxd3#
- 2.Qf3#
- 2.Qg4#
- 1...Qa8
- 2.Sxd3#
- 2.Qf3#
- 2.Qg4#
- 1...Re8
- 2.Rf5#
- 2.Qf3#
- 2.Qg4#
- 1...Rg8
- 2.Rf5#
- 2.Qf3#
- 2.Qxe4#
- 1...Sc3
- 2.Sxd3#
- 2.Qf3#
- 2.Qg4#
- 1...Sc5
- 2.Bxc7#
- 2.Qf3#
- 2.Qg4#
- 1...Sg5
- 2.Rh4#
- 1...Sd6
- 2.Qf3#
- 2.Qg4#
- 2.Qe5#
- 1...Sf6
- 2.Rf5#
- 2.Qf3#
- 1...dxe2!
- threat
- 1.Sge2+?
- Keys
- 1.Qe1!
- threat
- 2.Qxe4#
- 1...Sxd2
- 2.Qxd2#
- 1...Sxf2
- 2.Qxf2#
- 1...Sxg3
- 2.fxg3#
- 1...Qe7
- 2.Sxd3#
- 1...Qa8
- 2.Sxd3#
- 1...Re8
- 2.Rf5#
- 1...Sc3
- 2.Sxd3#
- 1...Sc5
- 2.Bxc7#
- 1...Sg5
- 2.Rh4#
- 1...Sd6
- 2.Qe5#
- 1...Sf6
- 2.Rf5#
- threat
- 1.Qe1!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 16
- Sets
- Q(a);N_GUARD::S(A),XP(b)
- R(g);N_GUARD::R1(H),XR(g)
- R(g);N_GUARD::R1(H)
- R(g);N_GUARD,P_PINS(G)::R1(H)
- S(d);OGATE,P_SPINS(d),XP(F)::QAR2(C),XS(d)
- S(d);S_CUTQ(a)::S(A),XP(b)
- S(d);N_GUARD,S_CUTQ(a)::B(I),XB(f)
- S(d);S_CUTR(g)::R1(H)
- Tries
- Try
- S(G);CHECK
- Vars
- K(e);P-FLIGHT::QAB1(C)
- Refutation
- P(b);XS(G)
- Try
- B(I);XP(c)
- Threat
- B(I)
- Vars
- S(d);OGATE,P_SPINS(d),XP(F)::QAR2(C),XS(d)
- Q(a);N_GUARD::S(A),XP(b)
- R(g);N_GUARD::R1(H),XR(g)
- B(f);N_GUARD::B(I)
- S(d);SBLOCK::R(H)
- Refutation
- S(d);XS(G)
- Try
- B(I);CHECK,XB(f)
- Vars
- Q(a);P_SPINQ(a)::S(A),XP(b)
- Refutation
- S(d);P_SPINS(d)
- Try
- Q(C);
- Threat
- DUALS(3)
- Vars
- S(d);SBLOCK::R(H)
- Refutation
- P(b);XQ(C)
- Try
- Actual
- Q(C);
- Threat
- QAR1(C),XS(d)
- Vars
- S(d);OGATE,XP(E)::QAB(C),XS(d)
- S(d);OGATE,XP(F)::QAR2(C),XS(d)
- S(d);OGATE,XS(G)::P(F),XS(d)
- Q(a);N_GUARD::S(A),XP(b)
- R(g);N_GUARD::R1(H)
- S(d);S_CUTQ(a)::S(A),XP(b)
- S(d);N_GUARD,S_CUTQ(a)::B(I),XB(f)
- S(d);SBLOCK::R(H)
- S(d);OGATE::QAB1(C)
- S(d);S_CUTR(g)::R1(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).