[Exercise] 1 Dan Challenge / 81Dojo Web System

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[Exercise] 1 Dan Challenge

The following exercise is borrowed from the official webpage of the Shogi Association, players with 1 dan or below may try this to testify their strength, while higher dan players might find them useful for reinforcing their strength:

(original url: http://www.shogi.or.jp/news/2016/11/post_1466.html)

1. https://postimg.org/image/xzepiaqbt/

2. https://postimg.org/image/6dbxxm6yx/

3. https://postimg.org/image/pjtqejcuh/

4. https://postimg.org/image/kz7jzlt55/

5. https://postimg.org/image/aqf2ts53d/

6. https://postimg.org/image/tk0vqs3bd/

7. https://postimg.org/image/k0r6xbft5/

8. https://postimg.org/image/uc3jpz7ih/

9. https://postimg.org/image/a601r3bux/

10. https://postimg.org/image/rkk9zd8zt/

Each question 10 points, one securing 70 points would be qualified as 1 dan or above  :D

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Q8) Bx6f
if ... B+x6f, then Rx4a+

Q9) S7e
if ... Sx7e, then Bx7c+

Q10) S*3h

if ... B+x3h, then B5e N*7c (if S*7c, Bx7c+ Nx3c S*9c Kx9c Rx9a+ white is terrible while black has a solid castle; if N*6d, its own powerful lance is blocked) Bx3c+

if ... P6f, then Sx3g Px6g+ Bx5e G*6d Sx6g Gx5e P*6f (lance attack is less powerful and removes an enemy horse, while the gold at 5e is still somehow floating)

Q6) B*6d
if ... S3f, then Bx7c+ R8a P*5e (Black has a promoted bishop on board and will gain a silver) 
if ... Sx5f, then Bx7c+ R8a P*5g (promoted bishop + 1 silver gain)

Q7) B*2a
if ... G3a, then B4c+ B*5b B+x3d Bx3d S4d
if ... G4b, then Bx5d+ (Gote has no pawns, so Rx5d Sx5d P*5c is not possible)
if ... Nx2e, then S4d (threatening S4c)

I guess each question within 5 minutes would be okay, including intuiting candidate moves, calculation for confirmation and making judgement

Don't push yourself too hard, exercise as such should be fun in nature

Thanks! very cool. how long are you supposed to spend on each problem?

Suggested answers:

Q1) P*3c
if ... Gx3c, then N4e, Bx2f, Nx3c=, Nx3c, Rx2f (gold-knight exchange)
if ... Nx3c, then P*3d (gain a knight)
if ... Bx3c, then N4e (bishop-silver fork)
if ... Bx2f, then Px3b+, Kx3b, Rx2f (gain a gold)

Q2) B*4h
if ... R7f or Rx5f, then Gx6h (gain a promoted bishop)
if ... B+x5h, then Bx6f, S3c, Gx5h (lose 1 gold, gain bishop and rook)

Q3) Sx3e?  (need assistance)
if ...Sx3e, then B*5e (King-knight fork, bishop promoted)
but not sure how it would go with ... B*7h

Q4) R6f
if ...R6b, then R6e, attacking the now unguarded pawn at 8e, otherwise rook breaks 6th file

Q5) B*1f the silver cannot be protected

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