MESON Chess Problem Database
Problem Display
PID: 205104 (4N3/q1R1K1QB/p3P3/1P1k4/N1p4p/2pnBn2/4P3/3Rbr1b w - - 0 1)
Larsen, Lars Aksglade (= Aksglade, Lars)
American Chess Bulletin, 1960
#2
11 + 11
| 15148 | Sadier Collection | 2020 |
SOLUTION
- SOUND
- Sets
- 1...Qxe3
- 2.Rd7#
- 1...Qd4
- 2.Rd7#
- 1...Qc5+
- 2.Rxc5#
- 1...Qb6
- 2.Sxb6#
- 1...Qb8
- 2.Rc5#
- 1...Qxc7+
- 2.Sxc7#
- 1...Qa8
- 2.Sb6#
- 2.Rc5#
- 2.Rd7#
- 1...Bf2
- 2.Sxc3#
- 1...Bg3
- 2.Sxc3#
- 1...Sd2
- 2.Sxc3#
- 1...Qxe3
- Tries
- 1.Sc5?
- threat
- 2.Be4#
- 1...Qxc5+
- 2.Rxc5#
- 1...Qxc7+
- 2.Sxc7#
- 1...Sg1
- 2.Qd4#
- 1...Sd2
- 2.Qd4#
- 1...Sh2
- 2.Qd4#
- 1...Sd4
- 2.Qxd4#
- 1...Sg5
- 2.Qd4#
- 1...Se5!
- threat
- 1.Bf2?
- threat
- 2.e4#
- 1...Qc5+
- 2.Rxc5#
- 1...Qxc7+
- 2.Sxc7#
- 1...Qe3
- 2.Rd7#
- 1...Qd4
- 2.Rd7#
- 1...Sg1
- 2.Qg5#
- 1...Sd2
- 2.Sxc3#
- 1...Sh2
- 2.Qg5#
- 1...Se5
- 2.Sf6#
- 1...Sg5
- 2.Qxg5#
- 1...Sd4!
- threat
- 1.Bc5?
- threat
- 2.e4#
- 1...Qxc5+
- 2.Rxc5#
- 1...Qxc7+
- 2.Sxc7#
- 1...Sg1
- 2.Qd4#
- 1...Sd2
- 2.Sxc3#
- 2.Qd4#
- 1...Sh2
- 2.Qd4#
- 1...Sd4
- 2.Qxd4#
- 1...Sg5
- 2.Qd4#
- 1...Se5!
- threat
- 1.Bb6?
- threat
- 2.e4#
- 1...Qxc7+
- 2.Sxc7#
- 1...Sg1
- 2.Qd4#
- 1...Sd2
- 2.Sxc3#
- 2.Qd4#
- 1...Sh2
- 2.Qd4#
- 1...Sd4
- 2.Qxd4#
- 1...Sg5
- 2.Qd4#
- 1...Se5!
- threat
- 1.Bxa7?
- threat
- 2.Sb6#
- 2.Rc5#
- 2.Rd7#
- 2.e4#
- 1...axb5
- 2.Sb6#
- 2.Rc5#
- 2.e4#
- 1...Bd2
- 2.Sb6#
- 2.Rd7#
- 2.e4#
- 1...Bf2
- 2.Sxc3#
- 2.Rd7#
- 2.e4#
- 1...Bg3
- 2.Sxc3#
- 2.Sb6#
- 2.Rc5#
- 2.e4#
- 1...Sg1
- 2.Sb6#
- 2.Rc5#
- 2.Rd7#
- 2.Qd4#
- 1...Sd2
- 2.Sxc3#
- 2.Sb6#
- 2.Rd7#
- 2.Qd4#
- 1...Sh2
- 2.Sb6#
- 2.Rc5#
- 2.Rd7#
- 2.Qd4#
- 1...Sd4
- 2.Sb6#
- 2.Rd7#
- 2.Qxd4#
- 1...Sg5
- 2.Sb6#
- 2.Rc5#
- 2.Rd7#
- 2.Qd4#
- 1...Se5!
- threat
- 1.Rxe1?
- threat
- 2.Sxc3#
- 1...Qxc7+
- 2.Sxc7#
- 1...Qd4
- 2.Rd7#
- 1...c2
- 2.Sc3#
- 1...Qc5+!
- threat
- 1.Rd2?
- threat
- 2.Sxc3#
- 1...Qc5+
- 2.Rxc5#
- 1...Qxc7+
- 2.Sxc7#
- 1...cxd2
- 2.Sc3#
- 1...Qd4
- 2.Rd7#
- 1...c2
- 2.Sc3#
- 1...Bxd2!
- threat
- 1.Rxa7?
- threat
- 2.Sb6#
- 2.Sc7#
- 2.Rd7#
- 1...Se5
- 2.Sb6#
- 2.Sc7#
- 1...Bg3
- 2.Sxc3#
- 2.Sb6#
- 1...Sd4
- 2.Sc7#
- 2.Rd7#
- 2.Qxd4#
- 1...axb5!
- threat
- 1.exd3?
- threat
- 2.Be4#
- 2.dxc4#
- 1...Qc5+
- 2.Rxc5#
- 1...Qxc7+
- 2.Sxc7#
- 1...Qxe3
- 2.Rd7#
- 2.dxc4#
- 1...Se5
- 2.dxc4#
- 1...Qd4
- 2.Rd7#
- 2.dxc4#
- 1...Sg1
- 2.dxc4#
- 1...Sd2
- 2.Sxc3#
- 2.dxc4#
- 1...Sh2
- 2.dxc4#
- 1...Sd4
- 2.dxc4#
- 1...Sg5
- 2.dxc4#
- 1...cxd3!
- threat
- 1.exf3?
- threat
- 2.Be4#
- 2.Qg5#
- 1...Qc5+
- 2.Rxc5#
- 1...Qxc7+
- 2.Sxc7#
- 1...Qxe3
- 2.Rd7#
- 1...Bxf3
- 2.Qg5#
- 1...Qd4
- 2.Rd7#
- 2.Qxd4#
- 1...Rg1
- 2.Be4#
- 1...Bd2
- 2.Be4#
- 1...Bg3
- 2.Sxc3#
- 2.Be4#
- 1...Rxf3!
- threat
- 1.Sc5?
- Keys
- 1.Bf4!
- threat
- 2.e4#
- 1...Qc5+
- 2.Rxc5#
- 1...Qxc7+
- 2.Sxc7#
- 1...Se5
- 2.Qxe5#
- 1...Qe3
- 2.Rd7#
- 1...Qd4
- 2.Rd7#
- 1...Sg1
- 2.Qe5#
- 1...Sd2
- 2.Sxc3#
- 1...Sh2
- 2.Qe5#
- 1...Sd4
- 2.Sf6#
- 1...Sg5
- 2.Qe5#
- threat
- 1.Bf4!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 5
- REMOVED MATES = 4
- Sets
- Q(k);N_GUARD,N_PINR(G),P_PINP(F),XB(C)::R(G)
- Q(k);N_GUARD,N_PINR(G),N_SPINS(e)::R(G)
- Q(k);CHECK,N_PINR(G)::R1(G),XQ(k)
- Q(k);N_GUARD,N_PINR(G)::S(D),XQ(k)
- Q(k);N_PINR(G)::R1(G)
- Q(k);CHECK,XR(G)::S(K),XQ(k)
- B(a);N_GUARD::S(D),XP(d)
- S(f);N_SPINS(e),S_CUTB(a)::S(D),XP(d)
- Tries
- Try
- S(D);
- Threat
- B(J)
- Vars
- Q(k);CHECK,N_PINR(G),XS(D)::R1(G),XQ(k)
- Q(k);CHECK,XR(G)::S(K),XQ(k)
- S(f);N_GUARD::QAR1(I)
- S(f);N_GUARD,N_SPINS(e)::QAR1(I)
- S(f);N_GUARD,N_SPINS(e)::QAR1(I),XS(f)
- Refutation
- S(f);
- Try
- B(C);
- Threat
- P(B)
- Vars
- Q(k);CHECK,N_PINR(G)::R1(G),XQ(k)
- Q(k);CHECK,XR(G)::S(K),XQ(k)
- Q(k);N_GUARD,N_PINR(G),P_PINP(F)::R(G)
- Q(k);N_GUARD,N_PINR(G),N_SPINS(e)::R(G)
- S(f);N_GUARD::QAR(I)
- S(f);N_SPINS(e),S_CUTB(a)::S(D),XP(d)
- S(f);SBLOCK::S(K)
- S(f);N_GUARD::QAR(I),XS(f)
- Refutation
- S(f);N_SPINS(e)
- Try
- B(C);
- Threat
- P(B)
- Vars
- Q(k);CHECK,N_PINR(G),XB(C)::R1(G),XQ(k)
- Q(k);CHECK,XR(G)::S(K),XQ(k)
- S(f);N_GUARD::QAR1(I)
- S(f);N_GUARD,N_SPINS(e)::QAR1(I),XS(f)
- Refutation
- S(f);
- Try
- B(C);
- Threat
- P(B)
- Vars
- Q(k);CHECK,XR(G)::S(K),XQ(k)
- S(f);N_GUARD::QAR1(I)
- S(f);N_GUARD,N_SPINS(e)::QAR1(I),XS(f)
- Refutation
- S(f);
- Try
- B(C);N_SPINR(G),XQ(k)
- Threat
- DUALS(4)
- Refutation
- S(f);
- Try
- R(A);N_PINS(e),XB(a)
- Threat
- S(D),XP(d)
- Vars
- Q(k);CHECK,XR(G)::S(K),XQ(k)
- Q(k);N_GUARD,N_PINR(G)::R(G)
- P(d);::S(D)
- Refutation
- Q(k);CHECK,N_PINR(G)
- Try
- R(A);
- Threat
- S(D),XP(d)
- Vars
- Q(k);CHECK,N_PINR(G)::R1(G),XQ(k)
- Q(k);CHECK,XR(G)::S(K),XQ(k)
- P(d);N_SPINS(e),XR(A)::S(D)
- Q(k);N_GUARD,N_PINR(G),N_SPINS(e)::R(G)
- P(d);::S(D)
- Refutation
- B(a);N_SPINS(e),XR(A)
- Try
- R(G);N_SPINR(G),XQ(k)
- Threat
- DUALS(3)
- Refutation
- P(j);XP(E)
- Try
- P(B);XS(e)
- Threat
- DUALS(2)
- Vars
- Q(k);CHECK,N_PINR(G)::R1(G),XQ(k)
- Q(k);CHECK,XR(G)::S(K),XQ(k)
- S(f);::R(A)+P(B)DCHECK,XP(g)
- S(f);::P(B),XP(g)
- Refutation
- P(g);P_SPINP(g),XP(B)
- Try
- P(B);XS(f)
- Threat
- DUALS(2)
- Vars
- Q(k);CHECK,N_PINR(G)::R1(G),XQ(k)
- Q(k);CHECK,XR(G)::S(K),XQ(k)
- Q(k);N_GUARD,N_PINR(G),P_PINP(F),XB(C)::R(G)
- B(c);XP(B)::QAR(I)
- R(b);::B(J)
- B(a);N_SPINS(e)::B(J)
- Refutation
- R(b);XP(B)
- Try
- Actual
- B(C);
- Threat
- P(B)
- Vars
- Q(k);CHECK,N_PINR(G)::R1(G),XQ(k)
- Q(k);CHECK,XR(G)::S(K),XQ(k)
- S(f);N_GUARD::QAR1(I),XS(f)
- Q(k);N_GUARD,N_PINR(G),P_PINP(F)::R(G)
- Q(k);N_GUARD,N_PINR(G),N_SPINS(e)::R(G)
- S(f);N_GUARD::QAR1(I)
- S(f);N_SPINS(e),S_CUTB(a)::S(D),XP(d)
- S(f);N_SPINS(e),SBLOCK::S(K)
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).