czwartek, 29 września 2011

Dan Heisman poleca - zrób sobie Test Taktyczny Baina w mniej niż 20-30 minut

Sprawdź swoją siłę taktyczną - czyli Dan Heisman (instruktor szachowy z USA) poleca (moim zdaniem bardzo ciekawy i prosty artykuł/test po angielsku). Myślę, że każdy z was bez problemu da sobie z nim radę.

Tutaj jest link do tego artykułu (w PDF):

Polecam najpierw przeczytać instrukcję, aby sobie zmierzyć poziom siły taktycznej - nazwanej przez Dana Heismana: *The Bain Rating Tactics Quiz

1. Black to play and win
[FEN "r1br2k1/ppb1qppp/1np2n2/8/P2NP3/2N4P/1PQ2PP1/R1BR1BK1 b - - 0 1"]

2. White to play and win
[FEN "r5k1/5ppp/5n2/6r1/p5q1/8/P3RP2/1B2RK1Q w - - 0 1"]

3. White to play and draw
[FEN "1k1r4/pp3QRR/8/2n5/8/8/PP1q1r1p/1K6 w - - 0 1"]

4. White to play and win
[FEN "3r3Q/pb1qkpp1/1p2pb1p/8/3N4/P3B3/1P3PPP/1Br1R1K1 w - - 0 1]

5. White to play; find the easiest win
[FEN "5k2/6b1/2p4p/P1pr4/2Q5/1P4P1/2P4P/7K w - - 0 1"]

6. White to play and win
[FEN "r4bkr/pppq2pp/2n5/1B1pp3/8/2NP4/PPP2PPP/R2Q1RK1 w - - 0 1"]

7. White to play and win
[FEN "1k3r2/1pp5/pb2Q2P/4R3/1P6/P5BP/5P1K/5q2 w - - 0 1"]

8. Black to play and draw
[FEN "8/8/3p1K2/3P3k/5P2/2P5/3Q4/5q2 b - - 0 1"]

9. Black to play and win
[FEN "r1b1k2r/ppp1bppp/2nq4/8/2B3n1/2p2N1P/PP2QPP1/RNB2RK1 b kq - 0 1"]

10. White to play and win
[FEN "r4n1r/pn4kp/4p1p1/3p4/3P4/1N4P1/P3RPBP/R5K1 w - - 0 1"]

11. White to play and win
[FEN "3Q4/5knp/1nN3p1/2p5/5P2/1q6/1P4PP/6K1 w - - 0 1"]

12. Black to play and win
[FEN "2r3k1/pp2ppbp/3pbnp1/q7/2rBPP2/2N2B1P/PPP3PK/R2QR3 b - - 0 1"]

Answers to Problems (tactical motif in parentheses) [ODPOWIEDZI do zadań/problemów]
1. (Double threat) 1…Rxd4 2.Rxd4 Qe5 threatens 3…Qxd4 and 3…Qh2#, so Black wins material. For example, 3.Bf4! Qxf4 (much better than 3…Qxd4 4.Bxc7) wins two pieces for a rook. You don't need to foresee 3.Bf4 – a good defensive move – for full credit. Not immediately 1…Qe5?, when White defends with 2.Nf3 or 2.f4.
2. (Back-rank mate) 1.Qxa8+ This "simple" problem tests diagonal board vision. For more on the three types of chess "vision," read the article on that topic in my book A Guide to Chess Improvement.
3. (Draw by perpetual check) 1.Qxb7+ Nxb7 2.Rxb7+ Ka8 (2…Kc8?? 3.Rhc7#) 3.Rxa7+ will draw by threefold repetition of position.
4. (Double check) 1.Nf5+ exf5 2.Bc5#.
5. (Pawn promotion) White is winning on any reasonable move, such as 1.a6. Thus, this does not qualify as just a "Play and Win" problem. Clearly easiest is Bain's answer 1.Qxd5 cxd5 2.a6 and the pawn cannot be stopped.
6. (Pin) White picks off a clean pawn and ruins Black's center with 1.Nxd5 since 1…Qxd5?? allows 2.Bc4.
7. (Discovered check) Bain's intended (and easiest) solution is 1.Qxb6 and if 1…cxb6 2.Re1+ king-any 3.Rxf1 winning a piece. A student found, verified by the computer, another winning but more complex line: 1.Qxb6 cxb6 2.Re8+ (similar is 2.Rf5+) 2…Ka7 3.Rxf8 (or 3.Bb8+ first) when White's dual threats of Bb8+ (with possible mating threats on the dark squares) and pushing the h-pawn give him a winning position. Give yourself full credit for the more difficult solution. 1.Rf5 also wins, but is a longer, convoluted forcing line, and not an "easy tactic."
8. (Stalemate) Down two pawns, Black is happy to force a draw with 1…Qxf4+ when the double attack (check and queen) forces 2.Qxf4 with stalemate.
9. (Removal of the guard) 1…Nd4 is a combination double attack and removal of the guard on h2. If White moves his queen anywhere aside from the hopeless 2.Qxe7+, then 2…Nxf3+ and 3…Qh2#. Instead, 2.Nxd4 allows the immediate 2…Qh2#. Finally, 2.hxg4 stops mate, but allows 2…Nxe2+, so the White queen is lost. This well known pattern also appears in a trap in the Morra Gambit and was featured as a basic pattern in my book Back to Basics: Tactics.
10. (Double attack) 1.Bxd5 and White has Black in trouble, as 1…exd5 2.Re7+ king-any 3.Rxb7 wins a pawn and invades with the rook. If Black does not take, the e-pawn is hanging, as White has a double attack on b7 and e6; 1…Nd8?? allows 2.Bxa8. White has a good game after 1.Rc1, but that's not the tactic.
11. (Skewer) 1.Ne5+ Ke6 2.Qg8+ skewers the king and queen, allowing 3.Qxb3. This is perhaps the least "obvious" pattern among the twelve, so it may take a few extra seconds to find the forcing line that works.
12. (Discovered attack) 1…Rxd4 snares the bishop, since if 2.Qxd4 Ng4+ wins the queen.

If you scored yourself strictly and:
  • achieved a Bain rating over 2000, your recognition score is very good, especially if your FIDE/USCF rating is distinctly below that.
  • achieved a Bain rating well above your normal slow rating (USCF or FIDE equivalent), that's a sign that your tactical study is paying benefit.
  • scored much lower than your rating, then additional basic tactics study is likely to yield good results.
  • got more than ten of the twelve in fifteen seconds or less, you don't need to study more Bain. Instead, continue with basic problems in books, such as my Back to Basics: Tactics or others mentioned in Tactical Sets and Goals. Once you have mastered them as well (repetitious study not always required), promote to intermediate texts like Jeff Coakley's terrific Winning Chess Exercises for Kids.
Online, a popular tactical server seems to be For similarly easy problems at that site set the problem rating level to 950 (min) to 1250 (max).
Once you master easy tactics, you should notice a distinct improvement in your play, especially if you consistently use this skill to determine whether your own candidate moves are safe!

* Bain Tactical Rating ≈ 600 + (150 * Number of Problems Correct) – 2 * (Total Time – 90 seconds)
For example, if you get eight correct in 305 seconds:
Approximate Bain Tactical Rating ≈ 600 + (150*8) – 2*(305-90) = 600 + 1200 – 430 = 1370

Mam nadzieję, że uda wam się osiągnąć dobre wyniki w tym teście :). Jeśli chcecie zobaczyć mój komentarz, to poniżej przytaczam:

Readers' Responses [Reakcje Czytelników]

Tomasz from Poland – I took this test and it is quite good. I did all the excercises (flawless) in exactly four minutes (240 seconds to twelve tasks is average twenty seconds). It means my tactical rating should be 2100. I am just 1801 ELO rated player, but I do not play OTB chess. Anyway, I play at FICS server in the TL (Tournament League) and STC (Slow Time Control) games. It helps me very much. Some time ago I have solved about 10,000 excercises (mostly rated 1000-1600) and some like 1,000 a bit harder (1600-1900). In summary: you are right – now I do not have to worry about my tactics on the average level (up to simple shots to 1900 level), but it is necessary to start solving much toughers ones (I mean 1900-2200). Thank you very much for your great test and very thought provoking ideas and articles! P.S. It was huge hint to know that in these positions "there is something to shoot." Most of them were extremely easy; just two tasks were a bit harder.

(ponadto także wypowiedzi trzech innych osób):

Julien from France – For what it is worth, I took the test. I have a FIDE rating of 2250 and the test gave me 2232 (twelve good answers for 186 seconds), pretty cool.
Paul from Scotland – Took the test. Eleven minutes. Eleven right answers – failed the first – going a bit too fast. Expected to get a really really decent score for eleven right and was "dismayed" to score 1150 way below my current rating of 1480. Thats where this novice nook had its powerful punch! The lesson was I am not recognising them easily enough and that this skill of instant pattern recognition can often have practical benefit OTB in finding the best move in a reasonable ammount of time.
GDC from the USA – I only got 1260 (six right in approx. six min) with an OTB rating over 1600. At Chess Tactics Server, I am often around 1400, so that might indicate there are still gains to be made there. I probably am a 1200 blitz player.

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