MESON Chess Problem Database
Problem Display
PID: 162087 (3r4/nR2p3/3bKB2/P5R1/1Pk3p1/Pp2Q1nr/1P2qp2/2NN1B2 w - - 0 1)
Katzenellenbogen, Israel Davidovich
3rd HM., Zadachi i Etyudi, 1928
#2
12 + 11
SOLUTION
- SOUND
- Sets
- 1...Qxf1
- 2.Qd4#
- 2.Qxb3#
- 2.Qc3#
- 1...Qd3
- 2.Bxd3#
- 2.Qd4#
- 2.Qxd3#
- 1...Bxb4
- 2.Rxb4#
- 1...Bf4
- 2.Rc5#
- 1...Bc5
- 2.Rxc5#
- 1...Be5
- 2.Qc5#
- 1...Bc7
- 2.Rc5#
- 1...Bb8
- 2.Rc5#
- 1...Sh1
- 2.Bxe2#
- 2.Qe4#
- 1...Se4
- 2.Bxe2#
- 2.Qd4#
- 2.Qxe4#
- 1...Sf5
- 2.Bxe2#
- 1...Sh5
- 2.Bxe2#
- 2.Qe4#
- 1...Qxf1
- Tries
- 1.Sxe2?
- threat
- 2.Sxg3#
- 2.Qd4#
- 2.Qc3#
- 1...Bxb4
- 2.Rxb4#
- 1...Sxf1
- 2.Qd4#
- 2.Qe4#
- 1...Sxe2
- 2.Bxe2#
- 2.Qd4#
- 2.Qe4#
- 1...Rh1
- 2.Qd4#
- 2.Qc3#
- 1...Bf4
- 2.Rc5#
- 2.Qc3#
- 1...Bc5
- 2.Rxc5#
- 2.Qc3#
- 1...Bc7
- 2.Rc5#
- 2.Qc3#
- 1...Bb8
- 2.Rc5#
- 2.Qc3#
- 1...Sh1
- 2.Sc1#
- 2.Sg1#
- 2.Sec3#
- 2.Sg3#
- 2.Sd4#
- 2.Sf4#
- 2.Qd4#
- 2.Qe4#
- 1...Se4
- 2.Sc1#
- 2.Sg1#
- 2.Sec3#
- 2.Sg3#
- 2.Sd4#
- 2.Sf4#
- 2.Qd4#
- 2.Qxe4#
- 1...Sf5
- 2.Sc1#
- 2.Sg1#
- 2.Sec3#
- 2.Sg3#
- 2.Sd4#
- 2.Sf4#
- 1...Sh5
- 2.Sc1#
- 2.Sg1#
- 2.Sec3#
- 2.Sg3#
- 2.Sd4#
- 2.Sf4#
- 2.Qd4#
- 2.Qe4#
- 1...Sb5
- 2.Sxg3#
- 1...Sc6
- 2.Sxg3#
- 2.Qc3#
- 1...Be5!
- threat
- 1.Be5?
- threat
- 2.Qd4#
- 2.Qxb3#
- 2.Qc3#
- 1...Bxb4
- 2.Rxb4#
- 1...Bxe5
- 2.Qc5#
- 1...Sxf1
- 2.Qd4#
- 1...Qd3
- 2.Bxd3#
- 2.Qd4#
- 2.Qxd3#
- 1...Bc5
- 2.Qxc5#
- 2.Qxb3#
- 2.Qc3#
- 1...Bc7
- 2.Qc5#
- 2.Qxb3#
- 2.Qc3#
- 1...Bb8
- 2.Qc5#
- 2.Qxb3#
- 2.Qc3#
- 1...Sh1
- 2.Bxe2#
- 2.Rxg4#
- 2.Qd4#
- 2.Qf4#
- 2.Qe4#
- 1...Se4
- 2.Bxe2#
- 2.Qd4#
- 2.Qxe4#
- 1...Sf5
- 2.Bxe2#
- 1...Sh5
- 2.Bxe2#
- 2.Qd4#
- 2.Qe4#
- 1...Sb5
- 2.Qxb3#
- 1...Sc6
- 2.Qxb3#
- 2.Qc3#
- 1...Rh6+!
- threat
- 1.Rxg4+?
- 1...Se4
- 2.Bxe2#
- 2.Rxe4#
- 2.Qd4#
- 2.Qxe4#
- 1...Bf4!
- 1...Se4
- 1.Re5?
- threat
- 2.Qc3#
- 1...Bxb4
- 2.Rxb4#
- 1...Bxe5
- 2.Qc5#
- 1...Sxf1
- 2.Re4#
- 1...Qd3
- 2.Bxd3#
- 2.Qxd3#
- 1...Sh1
- 2.Bxe2#
- 2.Re4#
- 2.Qf4#
- 2.Qe4#
- 1...Se4
- 2.Bxe2#
- 2.Rxe4#
- 2.Qxe4#
- 1...Sf5
- 2.Bxe2#
- 1...Sh5
- 2.Bxe2#
- 2.Re4#
- 2.Qe4#
- 1...Sb5!
- threat
- 1.Rc7+?
- 1...Bc5
- 2.Rgxc5#
- 2.Rcxc5#
- 1...Bxc7
- 2.Rc5#
- 1...Sc6!
- 1...Bc5
- 1.Sxe2?
- Keys
- 1.Bg2!
- threat
- 2.Bd5#
- 1...Qxe3+
- 2.Sxe3#
- 1...Qxd1
- 2.Qc3#
- 1...Bxb4
- 2.Rxb4#
- 1...Be5
- 2.Qc5#
- 1...Qd3
- 2.Qxd3#
- 1...Qf3
- 2.Qd4#
- 1...Qd2
- 2.Qxb3#
- 1...Bf4
- 2.Rc5#
- 1...Bc5
- 2.Rxc5#
- 1...Bc7
- 2.Rc5#
- 1...Bb8
- 2.Rc5#
- 1...Se4
- 2.Qd4#
- threat
- 1.Bg2!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 6
- REMOVED MATES = 1
- Sets
- B(h);OGATE,XP(G)::R1(L),XB(h)
- B(h);N_GUARD::R1(I)
- B(h);N_GUARD::R1(I),XB(h)
- B(h);N_PINQ(F)::QAR1(F)
- S(d);N_GUARD::B(C),XQ(a)
- Tries
- Try
- S(A);N_SPINQ(F),XQ(a)
- Threat
- DUALS(3)
- Vars
- B(h);OGATE,XP(G)::R1(L),XB(h)
- S(i);::B(C)+S(A),XS(d)
- Refutation
- B(h);
- Try
- B(K);N_SPINQ(F)
- Threat
- DUALS(3)
- Vars
- B(h);OGATE,XP(G)::R1(L),XB(h)
- B(h);N_GUARD,XB(K)::QAR1(F)
- S(d);N_SPINQ(a),XB(C)::QAR1(F)
- S(d);N_GUARD::B(C),XQ(a)
- S(i);::QAB1(F),XP(c)
- Refutation
- R(e);CHECK
- Try
- R(I);CHECK,XP(g)
- Refutation
- B(h);P_SPINB(h)
- Try
- R(I);N_SPINQ(F)
- Threat
- QAR1(F)
- Vars
- B(h);OGATE,XP(G)::R1(L),XB(h)
- B(h);N_GUARD,XR(I)::QAR1(F)
- S(d);N_GUARD,N_SPINQ(a),XB(C)::R(I)
- S(d);N_GUARD::B(C),XQ(a)
- Refutation
- S(i);
- Try
- R(L);CHECK
- Vars
- B(h);N_GUARD,XR(L)::R1(I)
- Refutation
- S(i);P_SPINS(i)
- Try
- Actual
- B(C);N_PINQ(a)
- Threat
- B(C)
- Vars
- Q(a);CHECK,XQ(F)::S(B),XQ(a)
- Q(a);N_PINQ(F),XS(B)::QAR1(F)
- B(h);OGATE,XP(G)::R1(L),XB(h)
- B(h);N_PINQ(F)::QAR1(F)
- Q(a);N_PINQ(F)::QAB1(F),XQ(a)
- Q(a);N_PINQ(F)::QAR1(F)
- Q(a);N_PINQ(F)::QAB1(F),XP(c)
- B(h);N_GUARD::R1(I)
- B(h);N_GUARD::R1(I),XB(h)
- S(d);N_PINQ(F)::QAR1(F)
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).