MESON Chess Problem Database
Problem Display
PID: 250237 (1B2n2b/1p6/3q1p2/8/1RN1Bk1P/K6P/8/3nQ1N1 w - - 0 1)
van der Ven, AMA
Brisbane Courier, 1927
#2
9 + 7
| 6490 | yacpdb | 2021 |
SOLUTION
- SOUND
- Sets
- 1...Sb2
- 2.Qe3#
- 1...Sf2
- 2.Qe3#
- 1...Sc3
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 1...Sg7
- 2.Bxd6#
- 1...Sb2
- Tries
- 1.Bb1?
- threat
- 2.Sb2#
- 2.Sd2#
- 2.Sa5#
- 2.Sb6#
- 2.Sxd6#
- 1...Qxb8
- 2.Sb2#
- 2.Sd2#
- 2.Sa5#
- 2.Se5#
- 2.Sb6#
- 2.Sd6#
- 1...Sf2
- 2.Qxf2#
- 2.Qe3#
- 1...Qe5
- 2.Sb2#
- 2.Sd2#
- 2.Se3#
- 2.Sa5#
- 2.Sxe5#
- 2.Sb6#
- 1...Qc7
- 2.Sb2#
- 2.Sd2#
- 2.Sa5#
- 2.Sb6#
- 1...Sb2
- 2.Sxb2#
- 2.Qf2#
- 2.Qe3#
- 1...Sc3
- 2.Qf2#
- 2.Qe3#
- 1...Se3
- 2.Qf2#
- 2.Qxe3#
- 1...Sc7
- 2.Sxd6#
- 1...b6
- 2.Sb2#
- 2.Sd2#
- 2.Sa5#
- 2.Sxb6#
- 2.Sxd6#
- 1...f5!
- threat
- 1.Bh1?
- threat
- 2.Sxd6#
- 1...Kf5
- 2.Qe4#
- 1...Qxb8
- 2.Sd6#
- 1...Sf2
- 2.Qxf2#
- 1...f5
- 2.Se2#
- 1...Qe5
- 2.Se3#
- 1...Sb2
- 2.Qf2#
- 1...Sc3
- 2.Qf2#
- 1...Se3
- 2.Qf2#
- 1...Qc7!
- threat
- 1.Bc2?
- threat
- 2.Sb2#
- 2.Sd2#
- 2.Sa5#
- 2.Sb6#
- 2.Sxd6#
- 1...Qxb8
- 2.Sb2#
- 2.Sd2#
- 2.Sa5#
- 2.Se5#
- 2.Sb6#
- 2.Sd6#
- 1...Sf2
- 2.Qxf2#
- 2.Qe3#
- 1...Qe5
- 2.Sb2#
- 2.Sd2#
- 2.Se3#
- 2.Sa5#
- 2.Sxe5#
- 2.Sb6#
- 1...Qc7
- 2.Sb2#
- 2.Sd2#
- 2.Sa5#
- 2.Sb6#
- 1...Sb2
- 2.Sxb2#
- 2.Qf2#
- 2.Qe3#
- 1...Sc3
- 2.Qf2#
- 2.Qe3#
- 1...Se3
- 2.Qf2#
- 2.Qxe3#
- 1...Sc7
- 2.Sxd6#
- 1...b6
- 2.Sb2#
- 2.Sd2#
- 2.Sa5#
- 2.Sxb6#
- 2.Sxd6#
- 1...f5!
- threat
- 1.Bg2?
- threat
- 2.Sxd6#
- 1...Kf5
- 2.Qe4#
- 1...Qxb8
- 2.Sd6#
- 1...Sf2
- 2.Qxf2#
- 1...f5
- 2.Se2#
- 1...Qe5
- 2.Se3#
- 1...Sb2
- 2.Qf2#
- 1...Sc3
- 2.Qf2#
- 1...Se3
- 2.Qf2#
- 1...Qc7!
- threat
- 1.Bd3?
- threat
- 2.Sb2#
- 2.Sd2#
- 2.Sa5#
- 2.Sb6#
- 2.Sxd6#
- 1...Qxb8
- 2.Sb2#
- 2.Sd2#
- 2.Sa5#
- 2.Se5#
- 2.Sb6#
- 2.Sd6#
- 1...Sf2
- 2.Qxf2#
- 2.Qe3#
- 1...Qe5
- 2.Sb2#
- 2.Sd2#
- 2.Se3#
- 2.Sa5#
- 2.Sxe5#
- 2.Sb6#
- 1...Qc7
- 2.Sb2#
- 2.Sd2#
- 2.Sa5#
- 2.Sb6#
- 1...Sb2
- 2.Sxb2#
- 2.Qf2#
- 2.Qe3#
- 1...Sc3
- 2.Qf2#
- 2.Qe3#
- 1...Se3
- 2.Qf2#
- 2.Qxe3#
- 1...Sc7
- 2.Sxd6#
- 1...b6
- 2.Sb2#
- 2.Sd2#
- 2.Sa5#
- 2.Sxb6#
- 2.Sxd6#
- 1...f5!
- threat
- 1.Bd5?
- threat
- 2.Sxd6#
- 1...Kf5
- 2.Qe4#
- 1...Qxb8
- 2.Sd6#
- 1...Sf2
- 2.Qxf2#
- 1...f5
- 2.Se2#
- 1...Qe5
- 2.Se3#
- 1...Sb2
- 2.Qf2#
- 1...Sc3
- 2.Qf2#
- 1...Se3
- 2.Qf2#
- 1...Qc7!
- threat
- 1.Bg6?
- threat
- 2.Sb2#
- 2.Sd2#
- 2.Sa5#
- 2.Sb6#
- 2.Sxd6#
- 1...Qxb8
- 2.Sb2#
- 2.Sd2#
- 2.Sa5#
- 2.Se5#
- 2.Sb6#
- 2.Sd6#
- 1...Sf2
- 2.Qxf2#
- 2.Qe3#
- 1...Qe5
- 2.Sb2#
- 2.Sd2#
- 2.Se3#
- 2.Sa5#
- 2.Sxe5#
- 2.Sb6#
- 1...Qc7
- 2.Sb2#
- 2.Sd2#
- 2.Sa5#
- 2.Sb6#
- 1...Sb2
- 2.Sxb2#
- 2.Qf2#
- 2.Qe3#
- 1...Sc3
- 2.Qf2#
- 2.Qe3#
- 1...Se3
- 2.Qf2#
- 2.Qxe3#
- 1...Sc7
- 2.Sxd6#
- 1...b6
- 2.Sb2#
- 2.Sd2#
- 2.Sa5#
- 2.Sxb6#
- 2.Sxd6#
- 1...f5!
- threat
- 1.Bxb7?
- threat
- 2.Sxd6#
- 1...Kf5
- 2.Qe4#
- 1...Qxb8
- 2.Sd6#
- 1...Sf2
- 2.Qxf2#
- 1...f5
- 2.Se2#
- 1...Qe5
- 2.Se3#
- 1...Sb2
- 2.Qf2#
- 1...Sc3
- 2.Qf2#
- 1...Se3
- 2.Qf2#
- 1...Qc7!
- threat
- 1.Bh7?
- threat
- 2.Sb2#
- 2.Sd2#
- 2.Sa5#
- 2.Sb6#
- 2.Sxd6#
- 1...Qxb8
- 2.Sb2#
- 2.Sd2#
- 2.Sa5#
- 2.Se5#
- 2.Sb6#
- 2.Sd6#
- 1...Sf2
- 2.Qxf2#
- 2.Qe3#
- 1...Qe5
- 2.Sb2#
- 2.Sd2#
- 2.Se3#
- 2.Sa5#
- 2.Sxe5#
- 2.Sb6#
- 1...Qc7
- 2.Sb2#
- 2.Sd2#
- 2.Sa5#
- 2.Sb6#
- 1...Sb2
- 2.Sxb2#
- 2.Qf2#
- 2.Qe3#
- 1...Sc3
- 2.Qf2#
- 2.Qe3#
- 1...Se3
- 2.Qf2#
- 2.Qxe3#
- 1...Sc7
- 2.Sxd6#
- 1...b6
- 2.Sb2#
- 2.Sd2#
- 2.Sa5#
- 2.Sxb6#
- 2.Sxd6#
- 1...f5!
- threat
- 1.Qe2?
- threat
- 2.Qf3#
- 2.Qg4#
- 1...Se3
- 2.Qf3#
- 2.Qxe3#
- 1...f5
- 2.Qf3#
- 1...Sf2
- 2.Qf3#
- 2.Qe3#
- 1...Kg3!
- threat
- 1.h5?
- threat
- 2.Qh4#
- 1...Sf2
- 2.Qe3#
- 1...Se3
- 2.Qxe3#
- 1...Kg5!
- threat
- 1.Bb1?
- Keys
- 1.Bc6!
- threat
- 2.Sxd6#
- 1...Kf5
- 2.Qe4#
- 1...Qxb8
- 2.Sd6#
- 1...Sf2
- 2.Qxf2#
- 1...f5
- 2.Se2#
- 1...Qe5
- 2.Se3#
- 1...Qc7
- 2.Sd6#
- 1...Sb2
- 2.Qf2#
- 1...Sc3
- 2.Qf2#
- 1...Se3
- 2.Qf2#
- threat
- 1.Bc6!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 4
- ADDED MATES = 5
- REMOVED MATES = 1
- Sets
- S(a);N_GUARD::QAB1(A)
- S(a);N_GUARD::QAB1(A),XS(a)
- S(f);N_GUARD::B(I),XQ(c)
- Tries
- Try
- B(G);
- Threat
- DUALS(5)
- Vars
- S(f);N_SPINQ(c)::R(E)+S(F),XQ(c)
- Refutation
- P(d);
- Try
- B(G);
- Threat
- R(E)+S(F),XQ(c)
- Vars
- K(b);N_GUARD,N_SPINQ(c),P-FLIGHT::QAB1(A)
- Q(c);N_PINR(E),N_SPINQ(c),XB(I)::R(E)+S(F)
- S(a);N_GUARD::QAR2(A),XS(a)
- P(d);SBLOCK::S(B)
- Q(c);N_PINR(E)::R(E)+S(F)
- S(a);N_GUARD::QAR2(A)
- Refutation
- Q(c);N_PINR(E)
- Try
- B(G);
- Threat
- DUALS(5)
- Vars
- S(f);N_SPINQ(c)::R(E)+S(F),XQ(c)
- Refutation
- P(d);
- Try
- B(G);
- Threat
- R(E)+S(F),XQ(c)
- Vars
- K(b);N_GUARD,N_SPINQ(c),P-FLIGHT::QAB1(A)
- Q(c);N_PINR(E),N_SPINQ(c),XB(I)::R(E)+S(F)
- S(a);N_GUARD::QAR2(A),XS(a)
- P(d);SBLOCK::S(B)
- Q(c);N_PINR(E)::R(E)+S(F)
- S(a);N_GUARD::QAR2(A)
- Refutation
- Q(c);N_PINR(E)
- Try
- B(G);
- Threat
- DUALS(5)
- Vars
- S(f);N_SPINQ(c)::R(E)+S(F),XQ(c)
- Refutation
- P(d);
- Try
- B(G);
- Threat
- R(E)+S(F),XQ(c)
- Vars
- K(b);N_GUARD,N_SPINQ(c),P-FLIGHT::QAB1(A)
- Q(c);N_PINR(E),N_SPINQ(c),XB(I)::R(E)+S(F)
- S(a);N_GUARD::QAR2(A),XS(a)
- P(d);SBLOCK::S(B)
- Q(c);N_PINR(E)::R(E)+S(F)
- S(a);N_GUARD::QAR2(A)
- Refutation
- Q(c);N_PINR(E)
- Try
- B(G);
- Threat
- DUALS(5)
- Vars
- S(f);N_SPINQ(c)::R(E)+S(F),XQ(c)
- Refutation
- P(d);
- Try
- B(G);XP(e)
- Threat
- R(E)+S(F),XQ(c)
- Vars
- K(b);N_GUARD,N_SPINQ(c),P-FLIGHT::QAB1(A)
- Q(c);N_PINR(E),N_SPINQ(c),XB(I)::R(E)+S(F)
- S(a);N_GUARD::QAR2(A),XS(a)
- P(d);SBLOCK::S(B)
- Q(c);N_PINR(E)::R(E)+S(F)
- S(a);N_GUARD::QAR2(A)
- Refutation
- Q(c);N_PINR(E)
- Try
- B(G);
- Threat
- DUALS(5)
- Vars
- S(f);N_SPINQ(c)::R(E)+S(F),XQ(c)
- Refutation
- P(d);
- Try
- Q(A);
- Threat
- DUALS(2)
- Vars
- P(d);::QAR1(A)
- Refutation
- K(b);S_FLIGHT
- Try
- P(H);
- Threat
- QAR2(A)
- Vars
- S(a);N_GUARD::QAB1(A)
- S(a);N_GUARD::QAB1(A),XS(a)
- Refutation
- K(b);N_SPINQ(c),S_FLIGHT
- Try
- Actual
- B(G);
- Threat
- R(E)+S(F),XQ(c)
- Vars
- K(b);N_GUARD,N_SPINQ(c),P-FLIGHT::QAB1(A)
- Q(c);N_PINR(E),N_SPINQ(c),XB(I)::R(E)+S(F)
- S(a);N_GUARD::QAR2(A),XS(a)
- P(d);SBLOCK::S(B)
- Q(c);N_PINR(E)::R(E)+S(F)
- S(a);N_GUARD::QAR2(A)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) &
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