The second quartet of the series "Godzilla Endgame Chess Puzzles" has been released:
https://glarean-magazin.ch/2017/10/14/c ... e-staffel/
The GECP test contains very difficult chess positions - even for today's engines.
(Use "translate" at the bottom right).
The first edition of the GECP can be found here:
https://glarean-magazin.ch/2017/09/30/s ... s-puzzles/
You can copy/download all puzzles (FEN / PGN).
Greeting: Walter
Godzilla Endgame Chess Puzzles (2)
Moderators: hgm, Rebel, chrisw
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- Full name: Walter Eigenmann
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Re: Godzilla Endgame Chess Puzzles (2)
Walter, one correction in number 6: after 1.Nf6 Rxd5 2.Nxd5 f5 now is mate in 8 with 3.Kb6 (no 3.Rc5).
Ignacio
Ignacio
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Re: Godzilla Endgame Chess Puzzles (2)
Thanks Walter !
Here are the 8 first positions in EPD format with solution.
Nn6/8/6r1/8/K7/1P6/1R6/3k2N1 w - - bm Ka3;
1B1K1k2/4N2p/3pP1pP/6p1/p7/3N2b1/2r2p2/8 w - - bm Nc6;
k3K3/P3N3/8/ppp4p/4p1p1/6R1/rn1PP2B/8 w - - bm Ra3;
7k/3q4/1p3P2/3pP1N1/7N/6p1/1P4P1/3n1KBn w - - bm Bd4 ;
8/p3N3/1n3N1p/2n5/pkP3PP/8/3P4/K7 w - - bm g5;
k5b1/5p2/2K5/1p1B3N/3rp1p1/1pRp4/8/7n w - - bm Kb6+;
6K1/5p2/6p1/1N2qk1p/p6R/7P/Pp2N3/2B5 w - - bm Ned4+;
Nk3n2/1n4N1/2P5/6p1/5p2/6p1/8/4K3 w - - bm c7+;
Here are the 8 first positions in EPD format with solution.
Nn6/8/6r1/8/K7/1P6/1R6/3k2N1 w - - bm Ka3;
1B1K1k2/4N2p/3pP1pP/6p1/p7/3N2b1/2r2p2/8 w - - bm Nc6;
k3K3/P3N3/8/ppp4p/4p1p1/6R1/rn1PP2B/8 w - - bm Ra3;
7k/3q4/1p3P2/3pP1N1/7N/6p1/1P4P1/3n1KBn w - - bm Bd4 ;
8/p3N3/1n3N1p/2n5/pkP3PP/8/3P4/K7 w - - bm g5;
k5b1/5p2/2K5/1p1B3N/3rp1p1/1pRp4/8/7n w - - bm Kb6+;
6K1/5p2/6p1/1N2qk1p/p6R/7P/Pp2N3/2B5 w - - bm Ned4+;
Nk3n2/1n4N1/2P5/6p1/5p2/6p1/8/4K3 w - - bm c7+;
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Re: Godzilla Endgame Chess Puzzles (2)
This first 8 positions reminds me 6 older ones :
4k1br/1K1p1n1r/2p2pN1/P2p1N2/2P3pP/5B2/P2P4/8 w - - bm Kc8;
6br/1KNp1n1r/2p2p2/P1ppRP2/1kP3pP/3PBB2/PN1P4/8 w - - bm Bxc5+;
8/bp4Pk/4KB2/R6p/2pNp1P1/p7/3p1Pnq/2r5 w - - bm Nc6;
q1r5/k3ppp1/2R5/PP1KP2r/2p4Q/2p1p3/5pP1/3R4 w - - bm Qd4+;
1B1k4/3p4/1Kp5/PpP2p2/1PqP1P2/8/1P6/8 w - - bm a6;
[Event "StrateGems"]
[Site "?"]
[Date "2015.??.??"]
[Round "?"]
[White "Wieland Bruch (after G .Heathcote)"]
[Black "?"]
[Result "1-0"]
[SetUp "1"]
[FEN "r7/1QpnN1Kp/p3P1b1/Nn1P1p2/3k3p/p4BP1/1rPPp2q/8 w - - 0 0"]
[PlyCount "13"]
1. d6 Nb6 2. dxc7 Nd6 3. Qc6 Ne4 (3... Ndc4 4. Qb5 $1 Rxb5 5. Nec6+ Kc5 6. Nb7#
) 4. Nb7 e1=Q (4... Ke5 5. Qd6+ $1 Nxd6 6. Nc6+ Kxe6 7. Nc5#) (4... Rb5 5. Qc3+
$1 Nxc3 6. Nc6+ Kc4 7. d3#) (4... Qxg3 5. Qd5+ $1 Nxd5 6. Nc6+ Kc4 7. Bxe2+ Qd3
8. Bxd3#) 5. Qc5+ $1 Nxc5 6. Nc6+ Kc4 7. Nd6# 1-0
4k1br/1K1p1n1r/2p2pN1/P2p1N2/2P3pP/5B2/P2P4/8 w - - bm Kc8;
6br/1KNp1n1r/2p2p2/P1ppRP2/1kP3pP/3PBB2/PN1P4/8 w - - bm Bxc5+;
8/bp4Pk/4KB2/R6p/2pNp1P1/p7/3p1Pnq/2r5 w - - bm Nc6;
q1r5/k3ppp1/2R5/PP1KP2r/2p4Q/2p1p3/5pP1/3R4 w - - bm Qd4+;
1B1k4/3p4/1Kp5/PpP2p2/1PqP1P2/8/1P6/8 w - - bm a6;
[Event "StrateGems"]
[Site "?"]
[Date "2015.??.??"]
[Round "?"]
[White "Wieland Bruch (after G .Heathcote)"]
[Black "?"]
[Result "1-0"]
[SetUp "1"]
[FEN "r7/1QpnN1Kp/p3P1b1/Nn1P1p2/3k3p/p4BP1/1rPPp2q/8 w - - 0 0"]
[PlyCount "13"]
1. d6 Nb6 2. dxc7 Nd6 3. Qc6 Ne4 (3... Ndc4 4. Qb5 $1 Rxb5 5. Nec6+ Kc5 6. Nb7#
) 4. Nb7 e1=Q (4... Ke5 5. Qd6+ $1 Nxd6 6. Nc6+ Kxe6 7. Nc5#) (4... Rb5 5. Qc3+
$1 Nxc3 6. Nc6+ Kc4 7. d3#) (4... Qxg3 5. Qd5+ $1 Nxd5 6. Nc6+ Kc4 7. Bxe2+ Qd3
8. Bxd3#) 5. Qc5+ $1 Nxc5 6. Nc6+ Kc4 7. Nd6# 1-0
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Re: Godzilla Endgame Chess Puzzles (2)
+ this one : 4b1k1/P4pPp/1R3P1P/2r5/8/1P6/1K6/8 w - - bm a8=B;
From here : http://www.talkchess.com/forum/viewtopi ... 012#728012
From here : http://www.talkchess.com/forum/viewtopi ... 012#728012
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- Full name: Herbert L
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Re: Godzilla Endgame Chess Puzzles (2)
I started a test with this 14 positions (GECP1+GECP2+6 old). The set is at the bottom of this post.
Condition 5 min/position, 6 pieces Syzygy (except for StingSF) , 6*4GHz.
4 engines (SF family) used :
Sting-sf-89 (no EGTB) : 9 of 14 matching moves
Stockfish_171011_x64_modern : 5 of 14 matching moves
SF-McBrain-27_x64_modern : 6 of 14 matching moves
Stockfish_171011_matefinder : 7 of 14 matching moves
Only 3 positions never found : #2, #11 and #12.
Position #13(a6) is easy to find (but the point is to find the mate).
I'll run a longer test with multiple runs later.
Details :
14 positions :
Condition 5 min/position, 6 pieces Syzygy (except for StingSF) , 6*4GHz.
4 engines (SF family) used :
Sting-sf-89 (no EGTB) : 9 of 14 matching moves
Stockfish_171011_x64_modern : 5 of 14 matching moves
SF-McBrain-27_x64_modern : 6 of 14 matching moves
Stockfish_171011_matefinder : 7 of 14 matching moves
Only 3 positions never found : #2, #11 and #12.
Position #13(a6) is easy to find (but the point is to find the mate).
I'll run a longer test with multiple runs later.
Details :
Code: Select all
Analyzing engine: Sting-sf-89
1) Ka4-a3 b3-b4
2) Ne7-c6 Ne7xg6
3) Rg3-a3 Rg3-a3 * 121 Seconds
4) Bg1-d4 Bg1-d4 * 290 Seconds
5) g4-g5 Ka1-a2
6) Kc6-b6 Kc6-b6 * 170 Seconds
7) Ne2-d4 Ne2-d4 * 4 Seconds
8) c6-c7 c6-c7 * 0 Seconds
9) Kb7-c8 Kb7-c8 * 2 Seconds
10) Be3xc5 Be3xc5 * 8 Seconds
11) Nd4-c6 g7-g8B
12) Qh4-d4 Qh4xe7
13) a5-a6 a5-a6 * 0 Seconds
14) d5-d6 d5-d6 * 27 Seconds
9 of 14 matching moves
18/10/17 21:35:32, Total time: 00:50:22 Rated time: 35:22 = 2122 Seconds
--------------------------------------------------------------------------------
Analyzing engine: Stockfish_171011_x64_modern
1) Ka4-a3 Ka4-a3 * 5 Seconds
2) Ne7-c6 Ne7xg6
3) Rg3-a3 Rg3-a3 * 129 Seconds
4) Bg1-d4 Nh4-g6
5) g4-g5 g4-g5 * 212 Seconds
6) Kc6-b6 Nh5-f6
7) Ne2-d4 Bc1xb2
8) c6-c7 Ng7-e8
9) Kb7-c8 a5-a6
10) Be3xc5 Kb7-b6
11) Nd4-c6 g7-g8Q
12) Qh4-d4 Qh4xe7
13) a5-a6 a5-a6 * 0 Seconds
14) d5-d6 d5-d6 * 94 Seconds
5 of 14 matching moves
18/10/17 22:48:29, Total time: 00:58:14 Rated time: 52:20 = 3140 Seconds
--------------------------------------------------------------------------------
Analyzing engine: SF-McBrain-27_x64_modern
1) Ka4-a3 Ka4-a3 * 16 Seconds
2) Ne7-c6 Ne7xg6
3) Rg3-a3 Rg3-b3
4) Bg1-d4 Nh4-g6
5) g4-g5 g4-g5 * 118 Seconds
6) Kc6-b6 Nh5-f6
7) Ne2-d4 Ne2-d4 * 116 Seconds
8) c6-c7 c6-c7 * 92 Seconds
9) Kb7-c8 a5-a6
10) Be3xc5 Re5-e8
11) Nd4-c6 g7-g8Q
12) Qh4-d4 Qh4xe7
13) a5-a6 a5-a6 * 0 Seconds
14) d5-d6 d5-d6 * 117 Seconds
6 of 14 matching moves
18/10/17 23:47:49, Total time: 00:54:34 Rated time: 47:39 = 2859 Seconds
--------------------------------------------------------------------------------
Analyzing engine: Stockfish_171011_matefinder
1) Ka4-a3 Ng1-f3
2) Ne7-c6 Ne7xg6
3) Rg3-a3 Rg3-a3 * 169 Seconds
4) Bg1-d4 Bg1-d4 * 22 Seconds
5) g4-g5 g4-g5 * 261 Seconds
6) Kc6-b6 Kc6-b6 * 171 Seconds
7) Ne2-d4 Bc1xb2
8) c6-c7 c6-c7 * 3 Seconds
9) Kb7-c8 a5-a6
10) Be3xc5 Re5-e8
11) Nd4-c6 g7-g8Q
12) Qh4-d4 Qh4xe7
13) a5-a6 a5-a6 * 0 Seconds
14) d5-d6 d5-d6 * 54 Seconds
7 of 14 matching moves
19/10/17 01:03:47, Total time: 00:49:21 Rated time: 46:20 = 2780 Seconds
Code: Select all
Nn6/8/6r1/8/K7/1P6/1R6/3k2N1 w - - bm Ka3;
1B1K1k2/4N2p/3pP1pP/6p1/p7/3N2b1/2r2p2/8 w - - bm Nc6;
k3K3/P3N3/8/ppp4p/4p1p1/6R1/rn1PP2B/8 w - - bm Ra3;
7k/3q4/1p3P2/3pP1N1/7N/6p1/1P4P1/3n1KBn w - - bm Bd4 ;
8/p3N3/1n3N1p/2n5/pkP3PP/8/3P4/K7 w - - bm g5;
k5b1/5p2/2K5/1p1B3N/3rp1p1/1pRp4/8/7n w - - bm Kb6+;
6K1/5p2/6p1/1N2qk1p/p6R/7P/Pp2N3/2B5 w - - bm Ned4+;
Nk3n2/1n4N1/2P5/6p1/5p2/6p1/8/4K3 w - - bm c7+;
4k1br/1K1p1n1r/2p2pN1/P2p1N2/2P3pP/5B2/P2P4/8 w - - bm Kc8;
6br/1KNp1n1r/2p2p2/P1ppRP2/1kP3pP/3PBB2/PN1P4/8 w - - bm Bxc5+;
8/bp4Pk/4KB2/R6p/2pNp1P1/p7/3p1Pnq/2r5 w - - bm Nc6;
q1r5/k3ppp1/2R5/PP1KP2r/2p4Q/2p1p3/5pP1/3R4 w - - bm Qd4+;
1B1k4/3p4/1Kp5/PpP2p2/1PqP1P2/8/1P6/8 w - - bm a6;
r7/1QpnN1Kp/p3P1b1/Nn1P1p2/3k3p/p4BP1/1rPPp2q/8 w - - bm d6;
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Re: Godzilla Endgame Chess Puzzles (2)
Yes, I know
I need to get a session of at least 2 hours to make a significant advance on the set. I didn't get such a motivation for a long time.
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Re: Godzilla Endgame Chess Puzzles (2)
Thanks a lot, Walter!
Nr. 5, the Garcia- study seems to be "cookable" to me:
[pgn]
[Event "Garcia 2000"]
[Site "?"]
[Date "2017.10.19"]
[Round "?"]
[White "GECP (05)"]
[Black "Endspiel S&S vs S&S"]
[Result "*"]
[SetUp "1"]
[FEN "8/p3N3/1n3N1p/2n5/pkP3PP/8/3P4/K7 w - -"]
1. g5 (1. Ka2 $2 Nxc4 2. d4 (2. Nc6+ Kb5 3. Nd4+ (3. Nxa7+
Kb6 $11) 3... Kb6 $11) 2... Ne6 3. Nf5 (3. d5 Nf4 $11)
3... Nf4 $11) 1... hxg5 2. h5 Nbd7 (2... Nb3+ 3. Kb1 Nxc4
4. Nc6+ Kb5 5. h6 $18) (2... Nxc4 3. h6 Nb3+ 4. Ka2 $18)
3. Nxd7 Nxd7 4. h6 Nf8 5. d3 g4 (5... Kc5 6. Nd5 $18)
6. Nd5+ Ka5 7. d4 g3 (7... Nh7 8. Ne3 $18) 8. Nf4 Kb4
9. d5 $18 *
[/pgn]
In the sideline
1. g5 hxg5 2. h5 Nxc4 3. h6 Nb3+ 4. Ka2 *
, if Black doesn't take on d2 now but plays 4... Nc1+,
[d]8/p3N3/5N1P/6p1/pkn5/8/K2P4/2n5 w - - 0 5
, White will have to block the black a-pawn with the King and then even after conversion of white h-pawn there isn't any progress to be seen to me anymore.
Here's Houdini on the position of the dia:
8/p3N3/5N1P/6p1/pkn5/8/K2P4/2n5 w - - 0 1
Analysis by Houdini 6.02 Pro x64-popc:
5.Kb1 a3 6.Sfd5+ Kb3 7.Sf5 Se5 8.Sde3 Se2 9.h7 Sf7 10.Sg4 Sh8 11.Se5 Kb4 12.Sh6 Kb3 13.Sf3 a2+ 14.Ka1 Sc1 15.d4 Sd3 16.Sg4 Sb4 17.Se3 Kc3 18.d5 Kd3 19.Sg4 Sxd5 20.Sxg5 Kd4 21.Sh6 Sf4 22.Kxa2 Sfg6 23.Sg4 Sf8 24.Ka3 Kd5 25.Kb3 Se6
= (0.00) Tiefe: 37/93 00:04:40 10372MN
...
5.Ka1 Sb3+ 6.Kb1 Sa3+ 7.Kb2 Sc4+ 8.Kc2 Sd4+ 9.Kd3 Se6 10.h7 Se5+ 11.Kc2 Sf7 12.Sf5 a3 13.d4 Sf8 14.Kb1 Kb3 15.d5 g4 16.Ka1 Kc3 17.Ka2 Kd3 18.Kxa3 Sxh7 19.Sxh7 Ke4 20.Sh4 Kxd5 21.Sf6+ Ke5 22.Sxg4+ Kf4 23.Sh2 Kg3 24.S4f3 Sd6 25.Kb4 Se8 26.Kb5 Sc7+ 27.Kc5 Kg2 28.Kc6 Se8 29.Kd5 Sf6+ 30.Kc5
= (0.03) Tiefe: 37/93 00:06:34 14503MN
I didn't have this one stored in my database, but somehow it looks familiar to me, maybe it's been in this forum or in an other one once already before
Nr. 5, the Garcia- study seems to be "cookable" to me:
[pgn]
[Event "Garcia 2000"]
[Site "?"]
[Date "2017.10.19"]
[Round "?"]
[White "GECP (05)"]
[Black "Endspiel S&S vs S&S"]
[Result "*"]
[SetUp "1"]
[FEN "8/p3N3/1n3N1p/2n5/pkP3PP/8/3P4/K7 w - -"]
1. g5 (1. Ka2 $2 Nxc4 2. d4 (2. Nc6+ Kb5 3. Nd4+ (3. Nxa7+
Kb6 $11) 3... Kb6 $11) 2... Ne6 3. Nf5 (3. d5 Nf4 $11)
3... Nf4 $11) 1... hxg5 2. h5 Nbd7 (2... Nb3+ 3. Kb1 Nxc4
4. Nc6+ Kb5 5. h6 $18) (2... Nxc4 3. h6 Nb3+ 4. Ka2 $18)
3. Nxd7 Nxd7 4. h6 Nf8 5. d3 g4 (5... Kc5 6. Nd5 $18)
6. Nd5+ Ka5 7. d4 g3 (7... Nh7 8. Ne3 $18) 8. Nf4 Kb4
9. d5 $18 *
[/pgn]
In the sideline
1. g5 hxg5 2. h5 Nxc4 3. h6 Nb3+ 4. Ka2 *
, if Black doesn't take on d2 now but plays 4... Nc1+,
[d]8/p3N3/5N1P/6p1/pkn5/8/K2P4/2n5 w - - 0 5
, White will have to block the black a-pawn with the King and then even after conversion of white h-pawn there isn't any progress to be seen to me anymore.
Here's Houdini on the position of the dia:
8/p3N3/5N1P/6p1/pkn5/8/K2P4/2n5 w - - 0 1
Analysis by Houdini 6.02 Pro x64-popc:
5.Kb1 a3 6.Sfd5+ Kb3 7.Sf5 Se5 8.Sde3 Se2 9.h7 Sf7 10.Sg4 Sh8 11.Se5 Kb4 12.Sh6 Kb3 13.Sf3 a2+ 14.Ka1 Sc1 15.d4 Sd3 16.Sg4 Sb4 17.Se3 Kc3 18.d5 Kd3 19.Sg4 Sxd5 20.Sxg5 Kd4 21.Sh6 Sf4 22.Kxa2 Sfg6 23.Sg4 Sf8 24.Ka3 Kd5 25.Kb3 Se6
= (0.00) Tiefe: 37/93 00:04:40 10372MN
...
5.Ka1 Sb3+ 6.Kb1 Sa3+ 7.Kb2 Sc4+ 8.Kc2 Sd4+ 9.Kd3 Se6 10.h7 Se5+ 11.Kc2 Sf7 12.Sf5 a3 13.d4 Sf8 14.Kb1 Kb3 15.d5 g4 16.Ka1 Kc3 17.Ka2 Kd3 18.Kxa3 Sxh7 19.Sxh7 Ke4 20.Sh4 Kxd5 21.Sf6+ Ke5 22.Sxg4+ Kf4 23.Sh2 Kg3 24.S4f3 Sd6 25.Kb4 Se8 26.Kb5 Sc7+ 27.Kc5 Kg2 28.Kc6 Se8 29.Kd5 Sf6+ 30.Kc5
= (0.03) Tiefe: 37/93 00:06:34 14503MN
I didn't have this one stored in my database, but somehow it looks familiar to me, maybe it's been in this forum or in an other one once already before
Peter.
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Re: Godzilla Endgame Chess Puzzles (2)
Good find !peter wrote:Thanks a lot, Walter!
Nr. 5, the Garcia- study seems to be "cookable" to me:
In the sideline
1. g5 hxg5 2. h5 Nxc4 3. h6 Nb3+ 4. Ka2 *
, if Black doesn't take on d2 now but plays 4... Nc1+,
8/p3N3/5N1P/6p1/pkn5/8/K2P4/2n5 w - - 0 5
, White will have to block the black a-pawn with the King and then even after conversion of white h-pawn there isn't any progress to be seen to me anymore.
...
2...Nxc4 is draw ! (a new test position )
9m08s For McBrain to find a score <1.00 and 12 min to evaluate 0.00 (i7-6*4GHz).
[D]8/p3N3/1n3N2/2n3pP/pkP5/8/3P4/K7 b - - bm Nc4
SF-McBrain-27_x64_modern:
..
40/61+ 04:24 2 844 901k 10 745k +4,87 2. ... Nbd7 3.Nxd7
40/70- 04:44 3 079 814k 10 822k +4,40 2. ... Nxc4
40/70- 09:08 6 973 157k 12 702k +0,76 2. ... Nxc4
40/78 12:00 8 854 416k 12 293k 0,00 2. ... Nxc4 3.h6 Nb3+ 4.Ka2 Nc1+ 5.Kb1 a3 6.Nc6+ Kc5 7.h7 a2+ 8.Ka1 Kxc6 9.h8Q Nxd2 10.Qc8+ Kb5 11.Qb7+ Ka5 12.Qxa7+ Kb5 13.Qb7+ Ka5 14.Qc7+ Ka6 15.Qc6+ Ka7 16.Qc5+ Kb7 17.Qb5+ Ka7 18.Qa5+ Kb7 19.Qd5+ Ka7 20.Qf7+ Ka6 21.Qe6+ Ka7 22.Qe3+ Ka8 23.Qa3+ Kb7 24.Qb4+ Ka6 25.Qd6+ Ka7 26.Qa3+ Kb7
41/43 12:28 9 145 833k 12 223k 0,00 2. ... Nxc4 3.h6 Nb3+ 4.Ka2 Nc1+ 5.Kb1 a3 6.Nc6+ Kc5 7.h7 a2+ 8.Ka1 Kxc6 9.h8Q Nxd2 10.Qc8+ Kb5 11.Qb7+ Ka5 12.Qxa7+ Kb5 13.Qb7+ Ka5 14.Qc7+ Ka6 15.Qc6+ Ka7 16.Qa4+ Kb7 17.Kb2 Ndb3 18.Qd7+ Kb8 19.Qd8+ Ka7 20.Qc7+ Ka6 21.Qc4+ Kb7 22.Qf7+ Ka6 23.Qc4+
42/43 12:50 9 377 650k 12 169k 0,00 2. ... Nxc4 3.h6 Nb3+ 4.Ka2 Nc1+ 5.Kb1 a3 6.Nc6+ Kc5 7.h7 a2+ 8.Ka1 Kxc6 9.h8Q Nxd2 10.Qc8+ Kb5 11.Qb7+ Ka5 12.Qxa7+ Kb5 13.Qb7+ Ka5 14.Qc7+ Ka6 15.Qc6+ Ka7 16.Qa4+ Kb7 17.Kb2 Ndb3 18.Qd7+ Kb8 19.Qd8+ Ka7 20.Qc7+ Ka6 21.Qc4+ Kb7 22.Qf7+ Ka6 23.Qc4+
43/43 13:12 9 604 565k 12 114k 0,00 2. ... Nxc4 3.h6 Nb3+ 4.Ka2 Nc1+ 5.Kb1 a3 6.Nc6+ Kc5 7.h7 a2+ 8.Ka1 Kxc6 9.h8Q Nxd2 10.Qc8+ Kb5 11.Qb7+ Ka5 12.Qxa7+ Kb5 13.Qb7+ Ka5 14.Qc7+ Ka6 15.Qc6+ Ka7 16.Qa4+ Kb7 17.Kb2 Ndb3 18.Qd7+ Kb8 19.Qd8+ Ka7 20.Qc7+ Ka6 21.Qc4+ Kb7 22.Qf7+ Ka6 23.Qc4+