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In addition, flight-giving sacrificial key
! 3 (10+6) C+
B48
1.Rb×e4? [2.Rf4! ]
but 1& Bb7!
1.Rb1? [2.Rf1! ]
but 1& Bb6!
1.Bf7? [2.R×b5+ d5 3.Re5! ]
but 1& Ba6!
1.Shf8! [2.Rf6+ e×f6 3.Be6! ]
1& Rb7 2.Rb×e4 [3.Rf4! ]
! 3 (8+12) C+
1& Rc7 2.Rb1 [3.Rf1! ]
1& Ra7 2.R×b5+ d5 3.R×d5!
17
B49
1.Rd1! [2.f3+ g×f3 3.e×f3! ]
1& R×d4 2.Qd3+ R×d3 3.e×d3!
1& B×d4 2.Q×b7+ Rc6 3.Q×c6!
1& e×d4 2.Qf5+ e×f5 3.Re8!
Captures on the same square at B1
Opening of lines of the same white piece at B1
White moves by the same piece at W2
! 3 (8+11) C+
B50
1.Be8! [2.Sg5+ f×g5 3.Bg6! ]
1& S×c3 2.Bc6+ Sd5 3.Q×d3!
1& S×e3 2.Bc6+ Sd5 3.Qe1!
1& S×f4 2.Bc6+ Sd5/K×e3 3.Qf4/Qf2!
B2 moves: three switchbacks after different captures
W3 mates: all by the
! 3 (10+11) C+
B51
1.a8=S! [2.Se5+ Kc5,K×e5 3.R×d5! ]
1& Q~ 2.S×f4+ (Sc1+?) Kc5/Ke5 3.Qe3/Sg6!
1& Q×e4! 2.Sc1+ (S×f2+?,S×b4+?) Kc5,Qd3/Ke5 3.Sb3/Rd5!
1& Q×c4! 2.S×b4+ Kc5/Ke5/Qd3 3.Sa6/S×c4/S4×d3!
1& Q×d6! 2.S×f2+ (Sc1+?,S×f4+?) Kc5/Ke5 3.Sfd3/e×f5!
1& R×d6 2.S×f2+ Kc5/Ke5 3.Sfd3/e×d5!
Black correction
White Siers battery
Zagoruiko 5x2 (plus other changed mates and one transferred)
Reciprocal dual avoidance after 1& Q×e4 and 1& .Q×d6
! 3 (13+12) C+
18
 B52
1& S×d3 2.e3+ Kc5 3.Q×b5!
1& Qg8 2.Qa7+ Sc5 3.Q×c5!
1& Bc3 2.d×c3+ Ke3 3.Bf4!
1.S×e7? [2.Sf5! ]
1& Qd8 2.Qa7+ Sc5/Qb6 3.Q×c5/Sf5!
1& Qf8 2.Qa7+ Sc5 3.Q×c5!
but 1& Qg8+!
1.Bf4? [2.Be3! ] 1.Bf5? [2.e3! ]
but 1& S×c2! but 1& S×c2!
! 3 14+13) C+
1.B×d5! [2.B×c4+,Be4+ Sd5,Qd5,Bd5 3.e3! ]
1& S×d5 2.Bf4 [3.Be3! ] g×f3+ 3.Bg3!
1& Q×d5 2.Sgf4 [3.Se6,e3! ] g×f3+ 3.Sg2!
1& B×d5 2.Sdf4 [3.Se6,e3! ] g×f3+ 3.Sg2!
1& S×d3 2.e3+ Kc5 3.Q×b5!
Black self-pins on d5 by capturing the sacrificed
Battery cross-check pin-mates
Triple change of function of the Creation of masked battery on f4 at W2 moves
move Bf4 with unpin of the g4
B53
1.Sd5! [2.Sc3+ Kd4 3.Rd2,R×f4! ]
1& S×d5 2.Qc4+ (Qb1+?,Qe2+?) Bd4 3.Qc2!
1& B×d5 2.Qb1+ (Qe2+?,R×f4+?) Kd4 3.Rd2!
1& R×d5 2.Qe2+ (R×f4+?,Qb1+?) Kd4 3.R×f4!
1& Sc4 2.Q×c4+ Bd4 3.Sc3!
Captures on d5 at B1 by three black pieces are matched by
three moves with double dual avoidance (W2)
! 3 (7+12) C+
B54
1.Sc7! [2.Qc6+ Rd5 3.Q×d5! ]
1& Q×d4 2.Sd3+ S×e7 3.Sf2!
1& R1×d4 2.Sf3+ S×e7 3.Sd2!
1& R8×d4 2.Sf7+ S×e7 3.Sd6!
1& S×e7 2.Qe2+ Qe3 3.Q×e3!
1& Rd6 2.Sf7+ S×e7/Re6 3.S×d6/R×e6!
Nietvelt and battery play
! 3 (11+8) C+
19
B55
1.Qd3! [2.Bh6+ Ke5 3.Sc6! ]
1& Qa4 2.Sge2+ B×e2/R×e2 3.S×e6/Qf3!
1& Qa6 2.Sde2+ B×e2/R×e2 3.Qe4/S×h5!
1& Qa8 2.Be2 [3.S×e6,S×h5! ]
Black defences by the same piece at B1
White moves on the same square at W2
! 3 (9+12) C+
B56
1& Q×e4,Rb×e4,Rh×e4,B×e4 2.Sb8+ Ke5 3.Sc6!
1.Re2! [2.Sb8+ Ke5 3.Sc6! ]
1& Q×e4 2.Sc5+ Ke5 3.Sd3!
1& Rb×e4,Rc4,Rb6 2.S7(×)b6+ Ke5 3.S(×)c4!
1& Rh×e4 2.S7f6+ Ke5 3.Sg4!
1& B×e4 2.Sf8+ Ke5 3.Sg6!
1& Sc5 2.S×c7+ Ke7 3.Qe8!
1& S×d5 2.Qe8+ Se7 3.Bd5!
4-variations complex with  reversed Dombrovskis (set mates
! 3 (8+10) C+
transformed to threat mates)
Fourfold change of error motifs (block - pin)
Thematic moves are B1, W2 and W3
B57
1.Kf8! [2.Qg8+ K×f6/Sf7 3.Qg6/Q×f7! ]
1& Rb×c5 2.Sd7+ Kd5 3.Sb6!
1& Re×c5 2.Sg8+ Kd5 3.S×e7!
1& S×c5 2.Se8+ Kd5 3.Sc7!
1& Q×h4 2.S×g4+ Kd5 3.Se3!
1& B×h4 2.S×e4+ Kd5 3.Sc3!
1& g×h4 2.Sh5+ Kd5 3.Sf4!
Six thematic variations, two  same-square mechanisms (on c5
and h4) are combined with W2 and W3 moves by the
(18 thematic moves)
! 3 (8+13) C+
20
B58
1.B×f7! [-]
1& Bd5 2.Be6 [3.f7! ]
1& Bc4! 2.Bd5 [3.f7! ] (2.Be6? B×d3!)
1& Bb3! 2.Bc4 [3.c3,f7! ] (2.Bf~? B×c2!)
1& B×a2! 2.Bb3 Kc3 3.f7!
1& B×f7+ 2.Kf8 B~ 3.f7!
1& B×d7 2.R×d7+ Kc5,Ke5 3.Rd5!
1& B~ 2.Be6 [3.f7! ]
Fourfold Loshinsky with three black corrections
! 3 (14+5) C+
B59
1.Qf5! [2.R×c5+ K×d6 3.Q×e5! ]
1& Bb3 2.Be4+ Kc4 3.R×c5!
1& Bc3 2.e4+ Kd4 3.B×c5!
1& e×f6 2.Qe4+ Ke6 3.S×c5!
1& S×c6 2.Bc4+ K×d6/K×c4 3.B×c5/Qd3!
1& Sb3,Sb7 2.Bc4+ K×c4 3.Qd3!
1& e×d6 2.Q×d7 [3.Sc7,R×c5,R×d6,Q×d6! ]
B1 - distant self-block
W2 - move to the same square (e4)
B2 - move by the
! 3 (11+13) C+
W3 - move to the same square (c5)
B60
1.B×d4! [2.d3+ S×d3 3.c×d3! ]
1& Q×d4 2.R5c4 [3.Re3! ] Sd3 3.c×d3!
1& R×d4 2.R3c4 [3.Qd5! ] Se6 3.Q×g6!
1& B×d4 2.Qc4 [3.Re5! ] Sd3/R×e7,Rd5 3.Q×d3,c×d3/Q(×)d5!
B1 defences to the same square
W2 moves to the same square (pinning a black piece)
! 3 (13+8) C+
21
B61
1.Qe4! [2.Rc3,Rc4,Rc5,Rc6,Rc7,Rc8 [3.Q×b1! ] Sd3 3.Sb3! ]
1& Ra3 2.Rc3 [3.Q×b1! ] Sd3 3.R×a3!
1& Ra4 2.Rc4 [3.Q×b1! ] Sd3,Ka2 3.R×a4!
1& Ra5 2.Rc5 [3.Q×b1! ] Sd3,Ka2 3.R×a5!
1& Ra6 2.Rc6 [3.Q×b1! ] Sd3,Ka2 3.R×a6!
1& Ra7 2.Rc7 [3.Q×b1! ] Sd3,Ka2 3.R×a7!
1& Ra8 2.Rc8 [3.Q×b1! ] Sd3,Ka2 3.R×a8!
6-fold grab
! 3 (6+6) C+
B62
1.Qf7? [2.Q×f3+ Ke1 3.Qh1! ]
1& e1=S 2.Sg3+ Kf2 3.Qa7!
but 1& Ke1!
1.Qh5! [2.Q×f3+ Ke1 3.Qh1! ]
1& Ke1 2.Qg5 [3.Qc1,Qg1! ] Kd1 3.Qd2!
1& e1=S 2.Sg3+ Kf2 3.Qc5!
1& f2 2.Qc5 [3.Q×f2! ] Ke1/e1=Q 3.Qc1/Sg3!
Multiple effects of the : key, second moves and mates
! 3 (3+5) C+
B63
1.Qb5! [2.Sf4+ Ke7 3.Qe8! ]
1& Qc6 2.Q×e2+ K×d5 3.Qe5!
1& Qc5 2.Qe8+ K×d5 3.Qe4!
1& Qc4 2.Qd7+ K×d5 3.Q×d6!
1& Qd7 2.Sf4+ Ke7 3.Q×d7!
1& Q×d8,R×d8 2.Sf4+ Ke7 3.Sf5!
! 3 (8+10) C+
22
B64
1.Qe7! [2.Sa6+ K×b3 3.Qa3! ]
1& Rd6 2.Qe5 [3.Q×c3! ] R×d3,Rd4 3.Q×b8!
1& Bd6 2.Qf6 [3.Q×c3! ] Be5 3.Q×b6!
1& d6 2.Qg7 [3.Q×c3! ] Rb7 3.Q×b7!
! 3 (8+8) C+
B65
1.Sb6? A [2.Sbc4,Sd5! ]
but 1& S×c3! a
1.Se7? B [2.Sd5,Sf5! ]
but 1& S×c1! b
1.Sd6? C [2.Sf5,S6c4! ]
but 1& S×g3! c
1.Rg8! [2.Re8+ Se4 3.Sc4,R×e4! ]
1& S×c3 a 2.Sd6 C (Se7? B) [3.Sf5! ] K×d4 3.Sb3!
! 3 (13+11) C+ 1& S×c1 b 2.Sb6 A (Sd6? C) [3.Sbc4! ] K×d2 3.Sc4!
1& S×g3 c 2.Se7 B (Sb6? A) [3.Sd5! ] K×f4 3.Bg5!
Cyclic Banny with dual avoidance
after giving flight to the ( Dresdener theme)
Cycle of double mates in thematic tries
Duel of knights
B66
1.Qb1! [2.Qa2+ b3 3.Q×b3! ]
1& B×d4 2.Qb3+ K×c5 3.Rb5! (Sd7?,Se4?)
1& S3×d4 2.S×d2+ K×c5 3.Sd7! (Se4?,Rb5?)
1& S5×d4 2.Se3+ K×c5 3.Se4! (Rb5?,Sd7?)
B1 moves are captures of the same piece
W3 mates appear in anti-triple
! 3 (12+12) C+
23
B67
1.Rd6! [2.Sc2 [3.Se4,d4! ]]
1& Q×b7 2.Sc6 [3.Se4,d4! ]
1& Qe1 2.Sde2 [3.Se4,d4! ]
1& Qh1 2.Sf3 [3.Se4,d4! ]
1& Qg6,Qf5 2.Sd(×)f5 [3.Se4,d4! ]
Moves by the same piece
1& Qd3 2.R×d3 [3.Rc6! ] K×c4 3.Rc3!
1& Se8 2.S×e6+ B×e6 3.d4!
1& Sd5 2.c×d5+ K×d4 3.d×e6!
1& Sb3 2.S×b3+ a×b3/Q×b3 3.d4/Se4,d4!
! 3 (11+10) C+
B68
1.Be2! [2.d3+ B×d3 3.Bf3! ]
1& Se~ 2.Qb4+ Qc4 3.Q×c4!
1& Sf5! 2.Q×g5 [3.Qg4,Qf4! ] Q×e6/Sf2 3.Qg4/Qf4!
1& Sd5!! 2.Qd6 [3.R×e5! ] B×d6 3.S×d6! (2.Qb4+?,Q×g5?)
1& Sc4!!! 2.Qc5 [3.Qd4,Q×c6! ] Sa5 3.Qd4!
(2.Qb4+?,Q×g5?,Qd6?)
Quaternary black correction
Four thematic variations: B1 moves by the same
Four W2 moves (and three mates) by the
! 3 (10+12) C+
B69
1.Ba7! [2.B×d4 [3.Rf4,e×d6,Sg3! ]]
1& Sc6 2.Rf4+ K×d5 3.Rd4!
1& Sf5 2.e×d6+ Kf3/Se7 3.Sd4/R×e7!
1& Se6 2.Sg3+ K×e5 3.Bd4!
1& K×e3 2.e×d6+ Kd2 3.Qc1!
B1 moves by the same piece, white piece interference
B2 moves by the
W3 mates on the same square, Umnov, pin-mates
Additional: Rudenko
! 3 (12+13) C+
24
B70
1.Sh5! [2.Qc7+ K×e6 3.Sg7! ]
1& Q×d3 2.Sef4+ Kd4 3.Se2!
1& B×d3 2.Sc7+ Kd4 3.Sb5!
1& Ra×d3 2.S×c5+ Kd4 3.Sb3!
1& Rf×d3 2.Seg7+ Kd4 3.S×f5!
1& Sb×d3 2.Sd8+ Kd4 3.Sc6!
1& Se×d3 2.S×g5+ Kd4 3.S×f3!
6x Siers bei 6 Verteidigungen auf demselben Feld,
davon 3x Fesselnutzung und 3x Weglenkung
(Themadopplung)
! 3 (7+14) C+
B71
1.Kg8! [2.Q×f7+ Kf5 3.Sd5! ]
1& Sd8 2.d×c7+ S×b6/Sc6 3.c×d8=S/c8=Q!
1& Se5 2.d7+ Sc6,S×b6,c×b6,c6 3.d8=S!
1& Se7+ 2.d×e7+ S×b6,c×b6,c6 3.e8=Q!
1& R×f3 2.Qe4+ Se5 3.Q×e5!
Three defences answered by three moves with check,
followed by promotions
! 3 (8+9) C+
B72
1.Bf3! [2.Sd7 [3.Sf8! ]]
1& Q×b6 2.R×e7+ (S×f4+?,R×d6+?) Sd×e7/Sc×e7 3.S×f4/R×d6!
1& Sc×b6 2.S×f4+ (R×d6+?,R×e7+?) Q×f4/S×f4 3.R×d6/R×e7!
1& Sd×b6 2.R×d6+ (R×e7+?,S×f4+?) S×d6/Q×d6 3.R×e7/S×f4!
1& Qe4 2.R×d6+ S×d6 3.Sc5!
(1& Sc3,Se3,Sc7 2.R×d6+ S×d6/Q×d6 3.R×e7/S×f4! )
For White: cyclic play
For Black: moves to the same square
Jacobs, Keller-2 paradox
! 3 (11+11) C+
25 [ Pobierz całość w formacie PDF ]