MESON Chess Problem Database
Problem Display
PID: 268479 (1b6/2p3Q1/3pN3/1P1kPB2/Np1r4/1PBR3n/2n4K/8 w - - 0 1)
Ohquist, Johannes
Die Schwalbe, 1931
#2
10 + 8
SOLUTION
- SOUND
- Sets
- 1...Ba7
- 2.Sxc7#
- 1...Sa1
- 2.Rxd4#
- 1...Se1
- 2.Rxd4#
- 1...Sa3
- 2.Rxd4#
- 1...Se3
- 2.Rxd4#
- 1...Sg1
- 2.Sf4#
- 1...Sf2
- 2.Sf4#
- 1...Sf4
- 2.Sxf4#
- 1...Sg5
- 2.Sf4#
- 1...bxc3
- 2.Sxc3#
- 1...dxe5
- 2.Qd7#
- 1...c5
- 2.Sb6#
- 1...c6
- 2.Sb6#
- 1...Ba7
- Tries
- 1.Kg3?
- 1...bxc3
- 2.Sxc3#
- 1...dxe5
- 2.Qd7#
- 1...Ba7
- 2.Sxc7#
- 1...Sa1
- 2.Rxd4#
- 1...Se1
- 2.Rxd4#
- 1...Sa3
- 2.Rxd4#
- 1...Se3
- 2.Rxd4#
- 1...Sg1
- 2.Sf4#
- 1...Sf2
- 2.Sf4#
- 1...Sf4
- 2.Sxf4#
- 1...Sg5
- 2.Sf4#
- 1...c5
- 2.Sb6#
- 1...c6
- 2.Sb6#
- 1...Rxd3+!
- 1...bxc3
- 1.Kxh3?
- threat
- 2.Sf4#
- 1...dxe5
- 2.Qd7#
- 1...Rxd3+!
- threat
- 1.Sg5?
- threat
- 2.Be4#
- 2.Be6#
- 1...dxe5
- 2.Qd7#
- 1...Sf2
- 2.Be6#
- 1...Sf4
- 2.Be4#
- 1...Sxg5!
- threat
- 1.Ba1?
- 1...Sxa1
- 2.Rxd4#
- 1...dxe5
- 2.Qd7#
- 1...Ba7
- 2.Sxc7#
- 1...Se1
- 2.Rxd4#
- 1...Sa3
- 2.Rxd4#
- 1...Se3
- 2.Rxd4#
- 1...Sg1
- 2.Sf4#
- 1...Sf2
- 2.Sf4#
- 1...Sf4
- 2.Sxf4#
- 1...Sg5
- 2.Sf4#
- 1...c5
- 2.Sb6#
- 1...c6
- 2.Sb6#
- 1...Rxd3!
- 1...Sxa1
- 1.Be1?
- 1...Sxe1
- 2.Rxd4#
- 1...dxe5
- 2.Qd7#
- 1...Ba7
- 2.Sxc7#
- 1...Sa1
- 2.Rxd4#
- 1...Sa3
- 2.Rxd4#
- 1...Se3
- 2.Rxd4#
- 1...Sg1
- 2.Sf4#
- 1...Sf2
- 2.Sf4#
- 1...Sf4
- 2.Sxf4#
- 1...Sg5
- 2.Sf4#
- 1...c5
- 2.Sb6#
- 1...c6
- 2.Sb6#
- 1...Rxd3!
- 1...Sxe1
- 1.Bb2?
- 1...dxe5
- 2.Qd7#
- 1...Ba7
- 2.Sxc7#
- 1...Sa1
- 2.Rxd4#
- 1...Se1
- 2.Rxd4#
- 1...Sa3
- 2.Rxd4#
- 1...Se3
- 2.Rxd4#
- 1...Sg1
- 2.Sf4#
- 1...Sf2
- 2.Sf4#
- 1...Sf4
- 2.Sxf4#
- 1...Sg5
- 2.Sf4#
- 1...c5
- 2.Sb6#
- 1...c6
- 2.Sb6#
- 1...Rxd3!
- 1...dxe5
- 1.Bd2?
- 1...dxe5
- 2.Qd7#
- 1...Ba7
- 2.Sxc7#
- 1...Sa1
- 2.Rxd4#
- 1...Se1
- 2.Rxd4#
- 1...Sa3
- 2.Rxd4#
- 1...Se3
- 2.Rxd4#
- 1...Sg1
- 2.Sf4#
- 1...Sf2
- 2.Sf4#
- 1...Sf4
- 2.Sxf4#
- 1...Sg5
- 2.Sf4#
- 1...c5
- 2.Sb6#
- 1...c6
- 2.Sb6#
- 1...Rxd3!
- 1...dxe5
- 1.Bxd4?
- threat
- 2.Qg2#
- 1...Sxd4
- 2.Rxd4#
- 1...dxe5
- 2.Qxe5#
- 2.Qd7#
- 1...Se3
- 2.Ba1#
- 2.Bb2#
- 2.Bc3#
- 2.Bxe3#
- 2.Bc5#
- 2.Bb6#
- 2.Ba7#
- 1...Sg1
- 2.Sf4#
- 1...Sf2
- 2.Sf4#
- 1...Sf4
- 2.Sxf4#
- 1...Sg5
- 2.Sf4#
- 1...Se1!
- threat
- 1.Rd2?
- 1...bxc3
- 2.Sxc3#
- 1...dxe5
- 2.Qd7#
- 1...Ba7
- 2.Sxc7#
- 1...Rd3
- 2.Qg2#
- 1...Sa1
- 2.Rxd4#
- 1...Se1
- 2.Rxd4#
- 1...Sa3
- 2.Rxd4#
- 1...Se3
- 2.Rxd4#
- 1...Sg1
- 2.Sf4#
- 1...Sf2
- 2.Sf4#
- 1...Sf4
- 2.Sxf4#
- 1...Sg5
- 2.Sf4#
- 1...c5
- 2.Sb6#
- 1...c6
- 2.Sb6#
- 1...Rxd2+!
- 1...bxc3
- 1.Qf6?
- 1...bxc3
- 2.Sxc3#
- 1...dxe5
- 2.Qd8#
- 1...Ba7
- 2.Sxc7#
- 1...Sa1
- 2.Rxd4#
- 1...Se1
- 2.Rxd4#
- 1...Sa3
- 2.Rxd4#
- 1...Se3
- 2.Rxd4#
- 1...Sg1
- 2.Sf4#
- 1...Sf2
- 2.Sf4#
- 1...Sf4
- 2.Sxf4#
- 1...Sg5
- 2.Sf4#
- 1...c5
- 2.Sb6#
- 1...c6
- 2.Sb6#
- 1...Rxd3!
- 1...bxc3
- 1.Qh8?
- 1...bxc3
- 2.Sxc3#
- 1...dxe5
- 2.Qd8#
- 1...Ba7
- 2.Sxc7#
- 1...Sa1
- 2.Rxd4#
- 1...Se1
- 2.Rxd4#
- 1...Sa3
- 2.Rxd4#
- 1...Se3
- 2.Rxd4#
- 1...Sg1
- 2.Sf4#
- 1...Sf2
- 2.Sf4#
- 1...Sf4
- 2.Sxf4#
- 1...Sg5
- 2.Sf4#
- 1...c5
- 2.Sb6#
- 1...c6
- 2.Sb6#
- 1...Rxd3!
- 1...bxc3
- 1.Kg3?
- Keys
- 1.Rd1!
- 1...Rd2+
- 2.Qg2#
- 1...Rxd1
- 2.Qg2#
- 1...bxc3
- 2.Sxc3#
- 1...dxe5
- 2.Qd7#
- 1...Ba7
- 2.Sxc7#
- 1...Rd3
- 2.Qg2#
- 1...Sa1
- 2.Rxd4#
- 1...Se1
- 2.Rxd4#
- 1...Sa3
- 2.Rxd4#
- 1...Se3
- 2.Rxd4#
- 1...Sg1
- 2.Sf4#
- 1...Sf2
- 2.Sf4#
- 1...Sf4
- 2.Sxf4#
- 1...Sg5
- 2.Sf4#
- 1...c5
- 2.Sb6#
- 1...c6
- 2.Sb6#
- 1...Rd2+
- 1.Rd1!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 0
- Sets
- B(h);N_GUARD::S(I),XP(g)
- S(a);N_GUARD::R1(D),XR(d)
- S(b);N_GUARD::S(I)
- S(b);N_GUARD::S(I),XS(b)
- P(c);XB(C)::S(E),XP(c)
- P(f);OGATEB,SBLOCK,XP(G)::QAR2(J)
- P(g);N_GUARD::S(E)
- Tries
- Try
- K(A);S_FLIGHT
- Vars
- P(c);XB(C)::S(E),XP(c)
- P(f);OGATEB,SBLOCK,XP(G)::QAR2(J)
- B(h);N_GUARD::S(I),XP(g)
- S(a);N_GUARD::R1(D),XR(d)
- S(b);N_GUARD::S(I)
- S(b);N_GUARD::S(I),XS(b)
- P(g);N_GUARD::S(E)
- Refutation
- R(d);CHECK,N_SPINR(d),XR(D)
- Try
- K(A);P-FLIGHT,XS(b)
- Threat
- S(I)
- Vars
- P(f);OGATEB,SBLOCK,XP(G)::QAR2(J)
- Refutation
- R(d);CHECK,N_SPINR(d),XR(D)
- Try
- S(I);
- Threat
- DUALS(2)
- Vars
- P(f);OGATEB,SBLOCK,XP(G)::QAR2(J)
- S(b);::B(H)
- Refutation
- S(b);XS(I)
- Try
- B(C);
- Vars
- S(a);N_GUARD,XB(C)::R1(D),XR(d)
- P(f);OGATEB,SBLOCK,XP(G)::QAR2(J)
- B(h);N_GUARD::S(I),XP(g)
- S(a);N_GUARD::R1(D),XR(d)
- S(b);N_GUARD::S(I)
- S(b);N_GUARD::S(I),XS(b)
- P(g);N_GUARD::S(E)
- Refutation
- R(d);N_SPINR(d),XR(D)
- Try
- B(C);
- Vars
- S(a);N_GUARD,XB(C)::R1(D),XR(d)
- P(f);OGATEB,SBLOCK,XP(G)::QAR2(J)
- B(h);N_GUARD::S(I),XP(g)
- S(a);N_GUARD::R1(D),XR(d)
- S(b);N_GUARD::S(I)
- S(b);N_GUARD::S(I),XS(b)
- P(g);N_GUARD::S(E)
- Refutation
- R(d);N_SPINR(d),XR(D)
- Try
- B(C);
- Vars
- P(f);OGATEB,SBLOCK,XP(G)::QAR2(J)
- B(h);N_GUARD::S(I),XP(g)
- S(a);N_GUARD::R1(D),XR(d)
- S(b);N_GUARD::S(I)
- S(b);N_GUARD::S(I),XS(b)
- P(g);N_GUARD::S(E)
- Refutation
- R(d);N_SPINR(d),XR(D)
- Try
- B(C);
- Vars
- P(f);OGATEB,SBLOCK,XP(G)::QAR2(J)
- B(h);N_GUARD::S(I),XP(g)
- S(a);N_GUARD::R1(D),XR(d)
- S(b);N_GUARD::S(I)
- S(b);N_GUARD::S(I),XS(b)
- P(g);N_GUARD::S(E)
- Refutation
- R(d);N_SPINR(d),XR(D)
- Try
- B(C);XR(d)
- Threat
- QAB(J)
- Vars
- S(a);OGATE,P_SPINS(a),XB(C)::R1(D),XS(a)
- S(b);N_GUARD::S(I)
- S(b);N_GUARD::S(I),XS(b)
- Refutation
- S(a);
- Try
- R(D);
- Vars
- P(c);XB(C)::S(E),XP(c)
- P(f);OGATEB,SBLOCK,XP(G)::QAR2(J)
- B(h);N_GUARD::S(I),XP(g)
- R(d);::QAB(J)
- S(a);N_GUARD::R1(D),XR(d)
- S(b);N_GUARD::S(I)
- S(b);N_GUARD::S(I),XS(b)
- P(g);N_GUARD::S(E)
- Refutation
- R(d);CHECK,N_SPINR(d),XR(D)
- Try
- Q(J);
- Vars
- P(c);XB(C)::S(E),XP(c)
- P(f);OGATEB,SBLOCK,XP(G)::QAR(J)
- B(h);N_GUARD::S(I),XP(g)
- S(a);N_GUARD::R1(D),XR(d)
- S(b);N_GUARD::S(I)
- S(b);N_GUARD::S(I),XS(b)
- P(g);N_GUARD::S(E)
- Refutation
- R(d);N_SPINR(d),XR(D)
- Try
- Q(J);
- Vars
- P(c);XB(C)::S(E),XP(c)
- P(f);OGATEB,SBLOCK,XP(G)::QAR(J)
- B(h);N_GUARD::S(I),XP(g)
- S(a);N_GUARD::R1(D),XR(d)
- S(b);N_GUARD::S(I)
- S(b);N_GUARD::S(I),XS(b)
- P(g);N_GUARD::S(E)
- Refutation
- R(d);N_SPINR(d),XR(D)
- Try
- Actual
- R(D);
- Vars
- R(d);CHECK::QAB(J)
- R(d);N_SPINR(d),XR(D)::QAB(J)
- P(c);XB(C)::S(E),XP(c)
- P(f);OGATEB,SBLOCK,XP(G)::QAR2(J)
- B(h);N_GUARD::S(I),XP(g)
- R(d);::QAB(J)
- S(a);N_GUARD::R1(D),XR(d)
- S(b);N_GUARD::S(I)
- S(b);N_GUARD::S(I),XS(b)
- P(g);N_GUARD::S(E)
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).