MESON Chess Problem Database
Problem Display
PID: 544 (8/2r1r2p/bR4p1/6Q1/3nkP2/3nP2R/q4p2/1B1N1N1K w - - 0 1)
Lertoria, Ernest
The Observer, 1962
#2
9 + 10
| 3174 | The Two-move Chess Problem Tradition and Development | 1966 |
| 5454 | Near Snap | 2013 |
SOLUTION
- SOUND
- Sets
- 1...Qxb1
- 2.Sd2#
- 1...Qb3
- 2.Sxf2#
- 2.Sd2#
- 1...Qc4
- 2.Sxf2#
- 2.Sd2#
- 1...Qd5
- 2.Sxf2#
- 2.Sd2#
- 1...Qe6
- 2.Sxf2#
- 2.Sd2#
- 1...Qf7
- 2.Sxf2#
- 2.Sd2#
- 1...Qg8
- 2.Sxf2#
- 2.Sd2#
- 1...Qa1
- 2.Sxf2#
- 2.Sd2#
- 1...Qd2
- 2.Sxd2#
- 1...Qa3
- 2.Sxf2#
- 2.Sd2#
- 1...Qa4
- 2.Sxf2#
- 2.Sd2#
- 1...Qa5
- 2.Sxf2#
- 1...Rc3
- 2.Sxc3#
- 1...Ra7
- 2.Sc3#
- 1...Rb7
- 2.Sc3#
- 1...Rcd7
- 2.Sc3#
- 1...Re5
- 2.Qxe5#
- 1...Red7
- 2.Qe5#
- 1...Rf7
- 2.Qe5#
- 1...Rg7
- 2.Qe5#
- 1...Bc4
- 2.Sc3#
- 1...Sc2
- 2.Sd2#
- 1...Se2
- 2.Sxf2#
- 1...Sf3
- 2.Sg3#
- 1...Sf5
- 2.Qg2#
- 1...Sc6
- 2.Sc3#
- 1...Se6
- 2.Qe5#
- 1...Qxb1
- Tries
- 1.Kg2?
- threat
- 2.Sg3#
- 1...Re5
- 2.Qxe5#
- 1...Se2
- 2.Sxf2#
- 1...Sf5!
- threat
- 1.Bxa2?
- threat
- 2.Sd2#
- 2.Bd5#
- 2.Qd5#
- 1...Sxf4
- 2.Sxf2#
- 1...Sc1
- 2.Sxf2#
- 1...Se1
- 2.Sxf2#
- 1...Sb2
- 2.Sxf2#
- 1...Sb4
- 2.Sxf2#
- 1...Sc5
- 2.Sxf2#
- 1...Se5
- 2.Sxf2#
- 1...Rc2
- 2.Bd5#
- 2.Qd5#
- 1...Rc4
- 2.Sd2#
- 1...Rc5
- 2.Sd2#
- 1...Rcd7
- 2.Sc3#
- 2.Sd2#
- 1...Re5
- 2.Sd2#
- 1...Red7
- 2.Sd2#
- 1...Bc4
- 2.Sc3#
- 2.Sd2#
- 1...Bb7
- 2.Sd2#
- 1...Sf3
- 2.Sg3#
- 2.Bd5#
- 2.Qd5#
- 1...Sf5
- 2.Sd2#
- 2.Qg2#
- 1...Sb3!
- threat
- 1.Re6+?
- 1...Qxe6
- 2.Sxf2#
- 2.Sd2#
- 1...Sxe6
- 2.Qe5#
- 1...Rxe6!
- 1...Qxe6
- 1.Kg2?
- Keys
- 1.Rd6!
- threat
- 2.Rxd4#
- 1...Qb2
- 2.Qd5#
- 1...Qc4
- 2.Sxf2#
- 2.Sd2#
- 1...Qd5
- 2.Sxf2#
- 2.Sd2#
- 2.Qxd5#
- 1...Qa1
- 2.Sxf2#
- 2.Sd2#
- 2.Qd5#
- 1...Qa4
- 2.Sxf2#
- 2.Sd2#
- 2.Qd5#
- 1...Rc4
- 2.Qd5#
- 1...Rcd7
- 2.Sc3#
- 1...Red7
- 2.Qe5#
- 1...Sc2
- 2.Sd2#
- 1...Se2
- 2.Sxf2#
- 1...Sb3
- 2.Qd5#
- 1...Sf3
- 2.Sg3#
- 1...Sb5
- 2.Bxd3#
- 1...Sf5
- 2.Qg2#
- 1...Sc6
- 2.Sc3#
- 1...Se6
- 2.Qe5#
- threat
- 1.Rd6!
Anticipated by 147677(1946)
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 10
- Sets
- Q(a);N_GUARD,N_SPINS(c),XB(A)::S(C)
- Q(a);N_GUARD::S(C),XQ(a)
- Q(a);N_GUARD::S(B),XP(b)
- R(h);N_GUARD::S(B),XR(h)
- R(h);N_GUARD::S(B)
- R(i);N_GUARD::QAR1(H),XR(i)
- R(i);N_GUARD::QAR1(H)
- B(f);S_CUTR(h)::S(B)
- S(d);N_SPINS(c),S_CUTQ(a)::S(C)
- S(d);S_CUTQ(a)::S(B),XP(b)
- S(d);SBLOCK::S(C)
- S(d);N_GUARD,SBLOCK::QAB(H)
- S(d);S_CUTR(h)::S(B)
- S(d);S_CUTR(i)::QAR1(H)
- Tries
- Try
- K(D);S_FLIGHT
- Threat
- S(C)
- Vars
- R(i);N_GUARD::QAR1(H),XR(i)
- S(d);S_CUTQ(a)::S(B),XP(b)
- Refutation
- S(d);
- Try
- B(A);N_PINS(c),XQ(a)
- Threat
- DUALS(3)
- Vars
- S(c);N_GUARD,XP(G)::S(B),XP(b)
- S(c);N_GUARD::S(B),XP(b)
- R(h);::S(C)
- R(i);::S(C)
- B(f);::S(C)
- Refutation
- S(d);
- Try
- R(I);CHECK
- Vars
- S(d);XR(I)::QAR1(H)
- Refutation
- R(i);XR(I)
- Try
- Actual
- R(I);
- Threat
- R1(I),XS(d)
- Vars
- Q(a);N_GUARD::QAB1(H)
- R(h);S_CUTQ(a)::QAB1(H)
- R(h);N_GUARD::S(B)
- R(i);N_GUARD::QAR1(H)
- S(d);N_SPINS(c),S_CUTQ(a)::S(C)
- S(d);S_CUTQ(a)::S(B),XP(b)
- S(d);S_CUTQ(a)::QAB1(H)
- S(d);SBLOCK::S(C)
- S(d);S_CUTB(f)::B(A),XS(c)
- S(d);N_GUARD,SBLOCK::QAB(H)
- S(d);S_CUTR(h)::S(B)
- S(d);S_CUTR(i)::QAR1(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).