Group A – #2 , Mate in two moves

Judge:

Dr. Paz Einat, *International Judge*

Director:

Marko Ložajić

It was an interesting idea by Marjan Kovačević to use the 4-phase reciprocal changes theme, which I promoted
in the last couple of years, as a theme for this year’s Belgrade Internet Tourney. My hunch was that much can be
done, but only after receiving the 17 anonymous problems from the director, Marko Ložajić, I could see that my hunch
was correct.

The problems presented a good variety of mechanisms realizing the theme. My clear preference was for mechanisms that
are purely 4-phase ones. One problem had a 2-phase mechanism and two others had 3-phase mechanisms, in both cases
somewhat artificially spread onto four phases. Such adaptation should not be dismissed, they can be of interest,
but I gave them lower preference.

The 4-phase requirement gave rise to mechanisms based solely on separation of defenses by the threats. This means that
both defenses would give rise to the same thematic mate but the threats determine that only one is a real defense.
Such mechanisms has a definite taste of artificiality, but in some way, they might look rather humoristic. I gave
these the lowest preference but I did not dismiss them altogether.

Now to the award. Grading the problems was not an easy task and the differences between the problems were small.
In addition to the thematic requirement, I used a variety of criteria and tried to weigh clarity versus complexity and
the importance of additional element.

Thematic condition

4-phase reciprocal changes

Reciprocal changes of two mates, spread over 4 phases, according to the pattern presented in the examples.

Example 1

Paz EINAT

3rd HM, The Problemist 2017

white Bh7g1 Ka8 Qa2 Pc6a4b4d4 Sb7f3 Re7a6
black Qe3 Pc7d7h6e5c4d3d2 Kd5 Ba5 Rh4

#2

(12+11)

1.Sb7-c5 ? threat: 2.Re7*d7 #
1...d7-d6 {a} 2.Bh7-g8 # {A}
but 1...Ba5-b6 !
1.Sf3*e5 ? threat: 2.Qa2*c4 #
1...Rh4*d4 {b} 2.Ra6*a5 # {B}
but 1...Qe3*d4 !
1.Sb7-d8 ? threat: 2.Re7*d7 #
1...d7-d6 {a} 2.Ra6*a5 # {B}
but 1...Ba5*b4 !
1.Sf3*d2 ! threat: 2.Qa2*c4 #
1...Rh4*d4 {b} 2.Bh7-g8 # {A}
1...Qe3*d2 2.Re7*e5 #
1...Qe3*d4 2.Bh7-g8 #

Example 2

Paz EINAT

1st Pr. Israel QCT 2017

white Bd1 Kc1 Qd6 Pd4f4b3f3 Se2g2 Rg5
black Qh6 Pa6b5f2 Kd3 Bb8g6 Se1

#2

(10+8)

1.Rg5-c5 ? threat: 2.Rc5-c3 #
1...Qh6*f4 + {a} 2.Se2*f4 # {A}
but 1...Se1*f3 !
1.Qd6-e6 ? threat: 2.Qe6-e3 #
1...Bb8*f4 + {b} 2.Sg2*f4 # {B}
but 1...Bb8-e5 !
1.Rg5-e5 ? threat: 2.Re5-e3 #
1...Qh6*f4 + {a} 2.Sg2*f4 # {B}
but 1...Bg6-e4 !
1.Qd6-c5 ! threat: 2.Qc5-c3 #
1...Bb8*f4 + {b} 2.Se2*f4 # {A}

Example 3

Мarjan Kovačević

3rd Pr. Die Schwalbe 1983

white Qc6 Sf7b3 Re8a4 Be1 Kh1
black Pc7h6c3 Sd5h2 Ba8a1 Kf3

#2

(7+8)

1.Qc6-b5 ? threat: 2.Qb5-e2 #
1...Sd5-e3 {a} 2.Sf7-e5 # {A}
but 1...Sd5-f4 !
1.Qc6-d7 ? threat: 2.Qd7-h3 #
1...Sd5-f4 {b} 2.Sb3-d4 # {B}
1...Sh2-g4 2.Qd7*g4 #
but 1...Sd5-e3 !
1.Re8-e4 ? threat: 2.Sf7-e5 #
1...Sd5-e3 {a} 2.Sb3-d4 # {B}
but 1...Sh2-g4 !
1.Ra4-e4 ! threat: 2.Sb3-d4 #
1...Sd5-f4 {b} 2.Sf7-e5 # {A}
1...c3-c2 2.Sb3-d2 #

Participants

Mark Basisty – UKR (1,7*)

Hubert Gockel – GER (2,8)

Mihail Hramtsevich – BLR (4*,9*)

Zoltán Labai – HUN (3*)

Vasil Markovcij – UKR (4*,9*)

Miodrag Mladenović – SRB (11)

Pavel Murashev – RUS (5,10)

CGS Narayanan – IND (12,16)

Vyacheslav Pilchenko – RUS (6*,13*)

Valery Shanshin – RUS (6*,13*)

Dragan Stojnić – SRB (14,17)

Gábor Tar – HUN (3*)

Anatoly Vasilenko – UKR (7*)

Daniel Wirajaya – INA (15)

**14 names**

from **8** countries

BPCF2019A - Award

1st Prize

Anatoly Vasilenko & Mark Basisty, UKR

white Qh5 Pb3a3b2f2f4h3c6 Ka5 Bh8 Sf5d8
black Pb5c7d6d5d3f7 Kc5 Rg7

#2

(12+8)

Set: 1...d4 2.??
**1.Qf3?** zz 1...d4 **a** 2.Sb7# **A**
1...d2 2.Qc3# 1...R~ 2.Bd4# 1...b4 2.axb4# but: 1...f6!
**1.Se3?** [2.Qxd5#] 1...Rg5 **b** 2.b4# **B**
(1...Kd4 2.Qxd5#) but: 1...f5!
**1.Qxf7?** zz 1...d4 **a** 2.b4# **B**
1...R~ 2.Bd4# 1...b4 2.axb4# but: 1...d2!
**1.Se7!** [2.Qxd5#] 1...Rg5 **b** 2.Sb7# **A**
1...f5 2.Se6# (1...Kd4 2.Qxd5#)
(1.Qd1? [2.Qc1#] 1...d2 2.Qc2# 1...Rg1 2.Bd4# but: 1...d4!)

FEN: 3N3B/2p2pr1/2Pp4/Kpkp1N1Q/5P2/PP1p3P/1P3P2/8

(C+ by Popeye)

2nd Prize

Vasil MARKOVCIJ & Mihail HRAMTSEVICH, UKR

white Bh2g2 Ka7 Qa1 Pf5d6c3 Se3 Rh7
black Pc4c5c6d7f6 Ke5 Sf4d3

#2

(9+8)

1.Rh4? zz 1...S~ **a** 2.Bxf4# **A**, but: 1...Kxd6!
1.Qa5? zz 1...S~ **a** 2.Qxc5# 1...Kxd6 **b** 2.Sxc4# **B**
but: 1...Sb4!
1.Qb1? zz 1...S~ **a** 2.Sxc4# **B** 1...Kxd6 **b** 2.Qb8#
but: 1...Sb2!
**1.Qd1!** zz 1...S~ **a** 2.Re7# 1...Kxd6 **b** 2.Bxf4# **A**

FEN: 8/K2p3R/2pP1p2/2p1kP2/2p2n2/2PnN3/6BB/Q7

(C+ by Popeye)

3rd Prize

Dragan STOJNIĆ, SRB

white Bh7h6 Kc1 Qb3 Pf6c6c2 Se6b5 Rd5
black Bb7 Ke4 Qf7 Pe7b6f5h4d4b4a3g3 Sg6 Ra5g4

#2

(10+14)

Set: 1...S~ 2.Bxf5#, 1...Se5! (2.Bf5?)
1.Sexd4? [2.Qf3#] 1...Qxd5 **a** 2.Qe3# **A**
1...Se5 2.Bxf5# but: 1...Rf4!
1.Sbc7? [2.Qd3#] 1...Rxd5 **b** 2.Qxd5# **B**
1...Se5 2.Rxd4# 1...Sf4 2.Bxf5# but: 1...Ba6!
1.Sec7? [2.Qd3#] 1...Qxd5 **a** 2.Qxd5# **B**
1...Se5 2.Rxd4# 1...Sf4 2.Bxf5# but: 1...Rg5!
**1.Sbxd4!** [2.Qf3#] 1...Rxd5 **b** 2.Qe3# **A**
1...Se5 2.Bxf5# 1...Rf4 2.Sg5#
(1.Bf4? [2.Rxd4#] 1...d3 2.Qxd3# 1...Sxf4 2.Bxf5#
1...Rxf4 2.Sg5# but: 1...Qxf6!)

FEN: 8/1b2pq1B/1pP1NPnB/rN1R1p2/1p1pk1rp/pQ4p1/2P5/2K5

(C+ by Popeye)

1st Hon. Mention

Vasil MARKOVCIJ & Mihail HRAMTSEVICH, UKR

white Bg5a8 Ka7 Qa1 Pe3f5d6c6 Sc3e7 Re8
black Pc4c5 Ke5 Sd3

#2

(11+4)

1.Qd1? zz
1...Kxd6 **a** 2.Bf4# **A** 1...S~ **b** 2.Qd5#
1...Sf4 2.exf4# but 1...Sb4!
1.Qb1? zz
1...Kxd6 **a** 2.Qb8# 1...S~ **b** 2.Sc8# **B**, but 1...Sf4!
1.Qa5? zz
1...Kxd6 **a** 2.Sc8# **B** 1...S~ **b** 2.Qxc5#, but 1...Sb4!, Sf4!
**1.Rf8!** zz 1...Kxd6 **a** 2.Sb5# 1...S~ **b** 2.Bf4# **A**

FEN: B3R3/K3N3/2PP4/2p1kPB1/2p5/2NnP3/8/Q7

(C+ by Popeye)

2nd Hon. Mention

C.G.S. NARAYANAN, IND

white Bh1e1 Ka8 Qc2 Pc6g6e3b4a3 Sd4 Re6h6
black Pc7d6h3h2e5a4 Kd5 Rg2

#2

(12+8)

1.Bg3? zz 1...e4 **a** 2.Rh5# **A**
but 1...exd4 b !
1.Kb7? zz 1...exd4 **b** 2.Qa2# **B**, but 1...e4 **a**a !
1.Bf2? [2.e4#] 1...e4 **a** 2.Qa2# **B**, but 1...exd4!
**1.Rf6!** zz
1...exd4 **b** 2.Rh5# **A** 1...e4 **a** 2.Rf5#
(1.g7? zz 1...exd4 2.e4# but 1...e4!)

FEN: K7/2p5/2PpR1PR/3kp3/pP1N4/P3P2p/2Q3rp/4B2B

(C+ by Popeye)

3-4th Hon. Mention

Mark BASISTY, UKR

white Bh2 Kb5 Qd3 Pc2g6 Sf5h5 Rd8g3
black Qc1 Ke5 Pg7e2e3g4h4e6b3 Sd7h6 Bf4

#2

(9+12)

(1.Se7? [2.Sc6#] 1...Sb8 2.Qd4# 1...Qxc2 2.Rxe3#, but 1...Qh1!)
1.Rxg4? [2.Bxf4#] 1...Bxh2 **a** 2.Qe4# **A**
1...Bg3 2.Qe4# 1...exf5 2.Re8# but 1...Qf1!
1.Sxe3? [2.Sc4#] 1...Sb6 **b** 2.Qd4# **B**
1...Bxe3 2.Rxe3# 1...Qxe3 2.Rxe3# but 1...Qxc2!
1.Rf3? [2.Bxf4#] 1...Bxh2 **a** 2.Qd4# **B**
1...Bg3 2.Qd4# 1...exf5 2.Re8# but 1...g3!
**1.Sd6!** [2.Sc4#] 1...Sb6 **b** 2.Qe4# **A**
1...Qxc2 2.Rxe3#

FEN: 3R4/3n2p1/4p1Pn/1K2kN1N/5bpp/1p1Qp1R1/2P1p2B/2q5

(C+ by Popeye)

3-4th Hon. Mention

Zoltán LABAI & Gábor TAR, HUN

white Ba8c3 Ka2 Qh1 Pe4d2 Se5f4 Rb1
black Bg1 Kc2 Qh4 Pc7a3g3b2 Sh3a1 Re7g5

#2

(9+11)

1.Sf3? [2.Se1#] 1...Rxe4 **a** 2.Bxe4# **A**
1...Bf2 2.Qd1# but 1...g2!
1.Sd5? [2.Sb4#] 1...Qxe4 **b** 2.Qxe4# **B**
1...Bc5 2.Qd1# but 1...c5!
1.Sc6? [2.Sb4#] 1...Rxe4 **a** 2.Qxe4# **B**
1...Bc5 2.Qd1# but 1...Rb5
**1.Sg2!** [2.Se1#] 1...Qxe4 **b** 2.Bxe4# **A**
1...Bf2 2.Qd1#
(1.Sfd3? [2.Se1,Sb4#] but 1...Qxe4!
1.Sed3? [2.Se1,Sb4#] but 1...Rxe4!)

FEN: B7/2p1r3/8/4N1r1/4PN1q/p1B3pn/KpkP4/nR4bQ

(C+ by Popeye)

5th Hon. Mention

Pavel MURASHEV, RUS

white Bg8e5 Kh6 Qg3 Pd6c3e2 Sb8c2 Rb5d1
black Pf7b6f6c5c4e4e3 Ke6

#2

(11+8)

1...fxe5 a 2.Qg6# A
1.Sxe3? zz 1...fxe5 **a** 2.Qg6# **A**
but 1...f5!
1.Rd5? zz 1...fxe5 **a** 2.Qxe5# **B**
1...Kxd5 2.Bxf7# 1...Kf5 2.Qh3# but 1...f5!
1.Bd4? zz 1...f5 **b** 2.Qe5# **B**
1...Kd5 2.Bxf7# 1...cxd4 2.Sxd4# but 1...Kf5!
**1.Bf4!** zz 1...f5 **b** 2.Qg6# **A**
1...Kf5 2.Sd4#

FEN: 1N4B1/5p2/1p1Pkp1K/1Rp1B3/2p1p3/2P1p1Q1/2N1P3/3R4

(C+ by Popeye)

6th Hon. Mention

Vyacheslav PILCHENKO & Valery SHANSHIN, RUS

white Bb8g2 Kc5 Qb5 Pf7g7 Se6 Rh6e4
black Pe7g5c4 Kf5 Bb7f6 Sa2

#2

(9+7)

Set: 1...Bd4+ 2.Sxd4# 1...c3 2.Qf1#
1.Qb1? [2.Qf1#] 1...Be5 **a** 2.Rf4# **A**
1...Bd4+ 2.Sxd4# 1...Bxe4 2.Qxe4# but 1...Sc1!
1.f8=Q? [2.Sd4#] 1...g4 **b** 2.Re5# **B** but 1...Bxe4!
1.Qxc4? [2.Qf1#] 1...Be5 **a** 2.Rxe5# **B**
1...Bd4+ 2.Sxd4# 1...Bxe4 2.Qxe4# but 1...Ba6!
**1.Qd7!** [2.Sd4#] 1...g4 **b** 2.Rf4# **A**

FEN: 1B6/1b2pPP1/4Nb1R/1QK2kp1/2p1R3/8/n5B1/8

(C+ by Popeye)

1st Commend.

Pavel MURASHEV, RUS

white Bh6b1 Kc6 Qf7 Pd7f6c5f4h3 Se5e2 Re4e1
black Qd3 Pc7b5d5d4g3 Rg8b4 Bd8a2 Kf5

#2

(13+11)

Set: 1...Kxe4 **a** 2.Sxg3# **A**
1. Sc4? [2.Re5#] 1...Kxe4 **a** 2.Qxd5# 1...Qxe4 **b** 2.Sxd4# B
but 1...Re8, dxe4!
1. Sg4? [2.Re5#] 1...Qxe4 **b** 2.Sxg3# **A**
1...Re8 2.Qh7# but 1...dxe4, Kxe4!
**1.Sf3!** [2.Re5#]
1...Kxe4 **a** 2.Sexd4# **B**
1...Qxe4(/dxe4) **b** 2.Sh4# 1...Re8 2.Sxg3#
1. Sg6? [2.Re5#] 1...dxe4 2.Sh4#
(1...Qxe4 2.Sxg3, Sh4#) but 1...Kxe4, Re8!

FEN: 3b2r1/2pP1Q2/2K2P1B/1pPpNk2/1r1pRP2/3q2pP/b3N3/1B2R3

(C+ by Popeye)

2nd Commend.

Vyacheslav PILCHENKO & Valery SHANSHIN, RUS

white Ba8h6 Kc1 Qh5 Pc2g4c4 Sd4e5 Rd1d5
black Be2h8 Ke4 Qb6 Pc5b4c3f6 Sg1e7 Rd8

#2

(11+11)

Set: 1...cxd4 **a** 2.R5xd4# **A** 1...fxe5 **b** 2.Rxe5# **B**
1.Rd3? [2.Re3#] 1...cxd4 **a** 2.R5xd4# **A**
1...Sxd5 2.Qf5# 1...Sf5 2.Qxf5# 1...Bxd3 2.cxd3# but 1...Rxd5!
1.Qh2? [2.Qf4#] 1...fxe5 **b** 2.Rxe5# **B**
1...Sh3 2.Qxe2# but 1...Sg6!
1.Sd3? [2.Sf2#] 1...cxd4 **a** 2.Re5# **B**
1...Bxd3 2.cxd3# but 1...Sh3!
**1.Sf5!** [2.Sg3#] 1...fxe5 **b** 2.R5d4# **A**
1...Sxf5 2.Qxf5#

FEN: B2r3b/4n3/1q3p1B/2pRN2Q/1pPNk1P1/2p5/2P1b3/2KR2n1

(C+ by Popeye)

3rd Commend.

C.G.S. NARAYANAN, IND

white Bh6b1 Kf7 Qh7 Pa7f2g3f5c6b4b3 Sf3 Rc2
black Pg4 Ke4

#2

(13+2)

1.a8=Q? zz 1...Kd5 **a** 2.Rd2# **A**
1...Kxf3 2.c7# 1...Kd3 2.f6# but 1...gxf3 **b** !
1.Be3? zz 1...gxf3 **b** 2.Rc5# **B**
1...Kd3 2.f6# 1...Kxf3 2.Qh1# but 1...Kd5 **a** !
1.Bf8? zz 1...Kd5 **a** 2.Rc5# **B**
1...Kd3 2.f6# 1...Kxf3 2.Qh1# but 1...gxf3 **b** !
**1.Bf4!** zz 1...gxf3 **b** 2.Rd2# **A** 1...Kd5 **a** 2.Rc5# **B**
1...Kd3 2.f6# 1...Kxf3 2.Qh1#

FEN: 8/P4K1Q/2P4B/5P2/1P2k1p1/1P3NP1/2R2P2/1B6

(C+ by Popeye)

4th Commend.

Hubert GOCKEL, GER

white Ba8 Kg7 Qf6 Pd6c5c3c2f2 Sf7c4 Rd3
black Pd7f3g5e5 Sb7b1 Rc6g2 Ke4 Bh2h5

#2

(11+11)

1.Sh6? [2.Qf5#] 1...Sxd6 **a** 2.Scxd6# **A**
1...Bg6 2.Qxf3# but 1...Bg4!
1.Scxe5? [2.Rd4#] 1...Rxd6 **b** 2.Sfxd6# **B**
1...Bxe5 2.Qxe5# 1...Rxf2 2.Sxg5# but 1...Sxc3!
1.Se3? [2.Qf5#] 1...Sxd6 **a** 2.Sfxd6# **B**
1...Bg4 2.Sxg5# but 1...Bg6!
**1.Sfxe5!** [2.Rd4#] 1...Rxd6 **b** 2.Scxd6# **A**
1...Sxc3 2.Sd2# 1...Bxe5 2.Qxe5#

FEN: B7/1n1p1NK1/2rP1Q2/2P1p1pb/2N1k3/2PR1p2/2P2Prb/1n6

(C+ by Popeye)

5h Commend.

Miodrag MLADENOVIĆ, SRB

white Qd4 Pc7f6h5d5f2 Ka4 Rg2 Sd2
black Kf5 Pd7g7d6h4e3e2 Be8c1 Rf8h1

#2

(9+12)

1.Sf3? [2.Rg5#] 1...gxf6 **a** 2.Qg4# **A**
1...Rg1 2.Sxh4# but 1...exf2!
1.c8=S? [2.Sxd6#] 1...Rxf6 **b** 2.Qe4# **B**
but 1...Ba3!
1.f4? [2.Rg5#] 1...gxf6 **a** 2.Qe4# **B**
but 1...Rg1!
**1.Sc4!** [2.Sxd6#] 1...Rxf6 **b** 2.Qg4# **A**
1...Ba3 2.Sxe3#
(1.Rg4? [2.Qf4#] but 1...g5!
1.fxe3? [2.Qf4#] 1...g5 2.Rf2# but 1...Rf1!)

FEN: 4brn1/2Pp2p1/3p1P2/3P1k1P/K2Q3p/4p3/3NpPR1/2b4r

(C+ by Popeye)

6th Commend.

Hubert GOCKEL, GER

white Bb1 Ke8 Qd8 Pe7e4 Sd6g4 Rc6b3
black Ph7a7b5c4 Kd4 Rd3 Bf1

#2

(9+7)

FEN: 3QK3/p3P2p/2RN4/1p6/2pkP1N1/1R1r4/8/1B3b2

(C+ by Popeye)

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