MESON Chess Problem Database
Problem Display
PID: 140462 (5b1Q/4p3/b7/1nB1R3/Kp2B3/1Pk3qR/1ppp4/n3NNr1 w - - 0 1)
Macleod, Norman Alasdair
4th Prize, BCF 132. Ty., 1972-1973
#2
9 + 12
SOLUTION
- SOUND
- Sets
- 1...Qd3
- 2.Rxd3#
- 1...Qe3
- 2.Rxe3#
- 1...Qf3
- 2.Rxf3#
- 1...Rh1
- 2.Rxg3#
- 1...Sd4
- 2.Bxb4#
- 1...Qd3
- Tries
- 1.Bg2?
- threat
- 2.Rxg3#
- 2.Re3#
- 1...Qxh3
- 2.Re3#
- 2.Qxh3#
- 1...Rxf1
- 2.Re3#
- 1...Rxg2
- 2.Re3#
- 1...dxe1Q
- 2.Re3#
- 1...dxe1S
- 2.Re3#
- 1...dxe1B
- 2.Re3#
- 1...dxe1R
- 2.Re3#
- 1...b1Q
- 2.Re3#
- 1...b1S
- 2.Re3#
- 1...b1B
- 2.Re3#
- 1...b1R
- 2.Re3#
- 1...c1S
- 2.Re3#
- 1...d1Q
- 2.Re3#
- 1...d1S
- 2.Re3#
- 1...d1B
- 2.Re3#
- 1...d1R
- 2.Re3#
- 1...Qd3
- 2.Rxd3#
- 1...Qe3
- 2.Rhxe3#
- 2.Rexe3#
- 1...Qf3
- 2.Rxf3#
- 2.Re3#
- 1...Bb7
- 2.Re3#
- 1...Bh6
- 2.Re3#
- 1...Bg7
- 2.Rxg3#
- 1...Sa3
- 2.Re3#
- 1...Sd4
- 2.Bxb4#
- 1...Sd6
- 2.Re3#
- 1...Sa7
- 2.Re3#
- 1...Sc7
- 2.Re3#
- 1...Sxb3!
- threat
- 1.Bf3?
- threat
- 2.Re3#
- 1...Qxe5
- 2.Bg2#
- 1...Sd4
- 2.Bxb4#
- 1...Sxb3!
- threat
- 1.Bd5?
- threat
- 2.Re3#
- 1...Qd3
- 2.Rxd3#
- 1...Qe3
- 2.Rhxe3#
- 2.Rexe3#
- 1...Sd4
- 2.Bxb4#
- 1...Bg7!
- threat
- 1.Bxg1?
- threat
- 2.Rxg3#
- 2.Rc5#
- 1...Qxh3
- 2.Rc5#
- 2.Qxh3#
- 1...Sxb3
- 2.Rc5#
- 1...dxe1Q
- 2.Rc5#
- 1...dxe1S
- 2.Rc5#
- 1...dxe1B
- 2.Rc5#
- 1...dxe1R
- 2.Rc5#
- 1...Qe3
- 2.Rc5#
- 1...b1Q
- 2.Rc5#
- 1...b1S
- 2.Rc5#
- 1...b1B
- 2.Rc5#
- 1...b1R
- 2.Rc5#
- 1...c1S
- 2.Rc5#
- 1...d1Q
- 2.Rc5#
- 1...d1S
- 2.Rc5#
- 1...d1B
- 2.Rc5#
- 1...d1R
- 2.Rc5#
- 1...Qd3
- 2.Rxd3#
- 2.Rc5#
- 1...Qf3
- 2.Rxf3#
- 2.Rc5#
- 1...Bh6
- 2.Rc5#
- 1...Sa3
- 2.Rc5#
- 1...Sd6
- 2.Rc5#
- 1...Sa7
- 2.Rc5#
- 1...Sc7
- 2.Rc5#
- 1...Sd4!
- threat
- 1.Rd5+?
- 1...Bg7
- 2.Bxb4#
- 1...Sd4
- 2.Bxb4#
- 2.Bxd4#
- 2.Qxd4#
- 1...e5!
- 1...Bg7
- 1.Re6+?
- 1...Sd4
- 2.Bxb4#
- 2.Bxd4#
- 2.Qxd4#
- 1...Bg7!
- 1...Sd4
- 1.Rxe7+?
- 1...Sd4
- 2.Bxb4#
- 2.Bxd4#
- 2.Qxd4#
- 1...Bg7!
- 1...Sd4
- 1.Bg2?
- Keys
- 1.Be3!
- threat
- 2.Rc5#
- 1...Qxe5
- 2.Bxg1#
- 1...Sd4
- 2.Bxd2#
- threat
- 1.Be3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 1
- REMOVED MATES = 4
- Sets
- Q(g);OGATE::R1(D),XQ(g)
- Q(g);OGATE::R(D),XQ(g)
- R(b);N_GUARD::R(D),XQ(g)
- S(i);SBLOCK::B(G),XP(h)
- Tries
- Try
- B(F);
- Threat
- DUALS(2)
- Vars
- R(b);XS(B)::QAB(I)+R(H),DCHECK
- R(b);XB(F)::QAB(I)+R(H),DCHECK
- P(e);XS(A)::QAB(I)+R(H),DCHECK
- P(c);::QAB(I)+R(H),DCHECK
- P(d);::QAB(I)+R(H),DCHECK
- P(e);::QAB(I)+R(H),DCHECK
- Q(g);OGATE::R1(D),XQ(g)
- B(j);::QAB(I)+R(H),DCHECK
- B(l);::QAB(I)+R(H),DCHECK
- B(l);::R(D),XQ(g)
- S(i);::QAB(I)+R(H),DCHECK
- S(i);SBLOCK::B(G),XP(h)
- Refutation
- S(a);XP(C)
- Try
- B(F);N_PINQ(g)
- Threat
- QAB(I)+R(H),DCHECK
- Vars
- Q(g);OGATEB,P_SPINQ(g),XR(H)::R(D)+B(F)
- S(i);SBLOCK::B(G),XP(h)
- Refutation
- S(a);XP(C)
- Try
- B(F);
- Threat
- QAB(I)+R(H),DCHECK
- Vars
- Q(g);OGATE::R1(D),XQ(g)
- S(i);SBLOCK::B(G),XP(h)
- Refutation
- B(l);
- Try
- B(G);XR(b)
- Threat
- DUALS(2)
- Vars
- S(a);XP(C)::QAB(I)+R(H),DCHECK
- P(e);XS(A)::QAB(I)+R(H),DCHECK
- Q(g);::QAB(I)+R(H),DCHECK
- P(c);::QAB(I)+R(H),DCHECK
- P(d);::QAB(I)+R(H),DCHECK
- P(e);::QAB(I)+R(H),DCHECK
- B(l);::QAB(I)+R(H),DCHECK
- S(i);::QAB(I)+R(H),DCHECK
- Refutation
- S(i);
- Try
- R(H);CHECK
- Vars
- B(l);P_SPINB(l)::B(G),XP(h)
- Refutation
- P(k);P_SPINP(k)
- Try
- R(H);CHECK
- Refutation
- B(l);P_SPINB(l)
- Try
- R(H);CHECK,XP(k)
- Refutation
- B(l);P_SPINB(l)
- Try
- Actual
- B(G);N_PINQ(g)
- Threat
- QAB(I)+R(H),DCHECK
- Vars
- Q(g);OGATEB,P_SPINQ(g),XR(H)::R(D)+B(G),XR(b)
- S(i);SBLOCK::B(G),XP(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).