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Alireza Firouzja vs Ehsan Ghaem Maghami
World Rapid Championship (2016) (rapid), Doha QAT, rd 3, Dec-26
Sicilian Defense: Paulsen. Bastrikov Variation (B48)  ·  0-1

ANALYSIS [x]

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Kibitzer's Corner
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Jul-24-17  BxChess: I had 37. Rb2+ 38. Nxb2 Rxb2+ 39. Ka1 Rxc2+ 40. Rf6 Bxf6#
Jul-24-17  notyetagm: < ChessHigherCat: My version takes a move longer but hey, what's the rush?: 37. Rb2+ 38. Nxb2 Rxb2+ 39. Ka1 Rb1+ 40. Ka2 Ra1#>

That's not mate, as 41 ♖h1x♖a1 is possible because 38 ♘d1x♖b2 cleared the back rank to allow the White h1-rook to help defend the White king.

<ALL OF A SUDDEN> that White h1-rook participates in the defense.

Jul-24-17  ChessHigherCat: <raviarun> <notyetagm> you guys are right, the N isn't on the back rank anymore. Time for bed.
Jul-24-17  saturn2: Similar mate to last monday's: protected rook on the 7th rank, king in the corner and the knight checkmates.
Jul-24-17  drollere: i fixated a bit on the annoying N on d1, until i realized the R check and exchange would take it off the board. thank you, KB on g7!
Jul-24-17  stst: 37......Rb2+
38.NxR RxN+
39.Ka1 RxN dis+#
Jul-24-17
Premium Chessgames Member
  agb2002: Black has a bishop for a knight.

White is about to block the b-file with Nb4.

Black wins with 37... Rb2+ 38.Nxb2 (38.Ka1 Nb3#) 38... Rxb2+ 39.Ka1 Nb3#.

Jul-24-17  leRevenant: Easy Macadeasy, as it should be today.
Jul-24-17
Premium Chessgames Member
  morfishine: <37...Rb2+> mating soon: 38.Nxb2 Rxb2+ 39.Ka1 Nb3#

*****

Jul-24-17
Premium Chessgames Member
  malt: 37...Rb2+ 38.N:b2 R:b2+ 39.Ka1 Nb3#
Jul-24-17
Premium Chessgames Member
  whiteshark: <37...Rb2+ 38.Nxb2 Rxb2+> The replacement delivery is basically implemented to the initial performance location... <39.Ka1 Nb3#>
Jul-24-17  Iwer Sonsch: This king can be mated with brute force. Rb2+ Nxb2 Rxb2+ Ka1 Rxc2# wins material and the game.
Jul-24-17  Iwer Sonsch: Okay, Rxc2+ Rd4 Bxd4#. Still.
Jul-24-17  Whitehat1963: I chose the main line but preferred Rxc2 as the last move.
Jul-24-17  zb2cr: Ah, the famous "Rook reloader" strikes again, with 37. ... Rb2+; 38. Nxb2, Rxb2+; 39. Ka1.

At this point, 39. ... Rxc2+ suggests itself, but it's not mate; White can interpose the Rook to stretch it out one move more.

The alternative, 39. ... Nb3#, does deliver mate.

Jul-24-17
Premium Chessgames Member
  thegoodanarchist: Monday is Monday again!

After a series of Wednesday-level puzzles the last few Mondays, we get a Monday-level puzzle.

Jul-24-17  Pasker: So damn easy..That's monday
Jul-24-17  Rama: Finally got one!
Jul-24-17
Premium Chessgames Member
  patzer2: Today's Monday puzzle (37...?) is good for demonstrating a simple mate-in-three with a minor piece giving mate from the third rank after <37...Rb2+ 38.Nb2 Rb2+ 39.Ka1 Nb3#.>

The game is also interesting because White misses several opportunities to win or draw before Black takes a decisive advantage.

The most clear win White misses is the skewer 26. Bf4! when play might continue 26...Qb6 27. Na4 (+3.66 @ 28 depth, Stockfish 8.)

Another winning or drawing possibility White misses is 28.Bd4! Ne8 29.Rxa6 Bxc2 30.Bxg7 Nxg7 31.Nd4 Bd3 (31...Rxb2? 32.Nc6 R8b3 33.Ra8+ Kf7 34.Ne5+ Kf6 35.Nxc4 Rxc3 36.Nxb2 +2.72 @ 27 depth Stocfish 8) 32.g4 to (+1.50 @ 30 depth, Stockfish 8).

White's decisive mistake is <30. Ka2?> allowing <30...Nc5! > (-4.27 @ 29 depth, Stockfish 8.)

Instead, White can hold it level with 30.Ra5! when play might continue 30...Bf5 31.Rd5 Bd3 32.Nf4 Bxc3 33.bxc3 Bc2 34.Ka2 Nb6 35.Rd2 Bb1+ 36.Kxb1 Nd5+ 37.Rb2 Rxb2+ 38.Bxb2 Nxf4 39.Ka2 Nxg2 40.Bc1 Re8 41.a4 Ne1 42.Ka3 Nd3 43.a5 Rb8 44.Be3 Rb3+ = (0.00 @ 28 depth, Stockfish 8.)

Jul-24-17
Premium Chessgames Member
  kevin86: Rook sac leads to simple mate in 2 ways.
Jul-24-17  King Harvest: What a nice teaching position for calculating with basic tactics. It's easy enough to get the R sac reload idea, but seeing that it obstructs the initial mate net and requires an additional move for a discovered checkmate is not trivial calculation for most beginners imo.
Jul-24-17  King Harvest: Such a nice teaching position it taught me! There's a second way mate! Lol@self
Jul-24-17
Premium Chessgames Member
  takchess: going to try to do a complete week of puzzles and giving it sufficient time. Here's my answer for today.
37...Rb2+
if 38 NXb2 Rxb2 +
39 Kf1 Nb3 ++
if 38 Kf1 Rxc2 discover check
some blocks by white that don't hold up and mate.
Jul-24-17
Premium Chessgames Member
  beenthere240: 39. K f1 is brilliant. The flying king!
Jul-24-17
Premium Chessgames Member
  OhioChessFan: ** Urgent Announcement **

We are running a Moves Prediction Contest for the Biel tournament at my forum. We got a late start advertising so the first round played earlier today won't count. Get your picks in for tomorrow's round ASAP!

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