13 The opening / Mix: A 1) c2-c3 This pawn move is the best of the three. The bishop cannot move to c5 (an active place for the bishop) because d4 wins another tempo. The moves 1. Nc3 and 1. Bd2 are not bad. 2) Qf3-g3 Playing two times with the same piece is correct when you can get a clear advantage. The queen attacks two pawns. The move 1. Be3 is better than 1. Nd5. 3) Ng8-f6 Developing is the best. White can reply 2. Be3 after a check by the queen. The queen is in the way of his own bishop. Capturing on f3 is a bad move. The pin is useful for Black. 4) Bf8-g7 Black must develop. The bishop move prepares 2. ... Nge7. Right away the move is very bad: Nf6#. The move 1. ... Bg4 is a waste of time if White plays h3. 5) Qd1-d2 After 1. g3 Nf3# White is mated. Capturing on d4 is not to be considered, because after 1. ... cxd4 the knight must return to b1 (2. Nb5 Qa5+). 6) Qd4-d3 The logical place for the queen. On e3 she is in the way of the bishop on c1. On d1 the queen must be developed again. 7) Nc6-d4 A fine move. The threat is Nxc2+ and besides that the move clears square c6. After that the irritating knight on d5 can be chased away. After 1. ... Nf6 the move 2. Bg5 annoys. This move is annoying after 1. ... Be6 as well (2. ... f6 3. Nxf6+) 8) Nf3-g5 Black cannot protect f7. 9) Ng8-f6 Developing is correct. Capturing on d4 only supports White’s development and 1. ... Qf6 is bad on account of 2. Ndb5. 10) c2-c3 The most natural move. Also 1. Nxd4 is a good move. The position arises now and then, because trainers (?) recommend their pupils this trap. After 1. Nxe5 Qg5 2. Nxf7 Qxg2 3. Rf1 Qxe4+ 4. Be2 Nf3# the point is on the scoreboard. 11) Qd1-e2 Wins a pawn after 1. ... Qe7 2. Qxe4 d6. After the popular response 1. ... Nf6, 2. Nc6+ decides. Nothing brings 1. Qf3 Nf6. The pawn move is too tame. 12) c6-c5 Very strong because White cannot take (Qb4+). The bishop on h6 faces a well protected pawn. On d6 the bishop is better off.
55 Rules / Legal position (Yes or no): A 1) example 2) text 3) example 4) No: pawn on a2 and a3 is not possible 5) Yes 6) No: before the last move White was in check 7) Yes: b2-b1Q+ is the last move 8) Drawing 9) Drawing 10) Yes: Black is in stalemate 11) Yes: b2-b1N is the last move 12) Yes: f4xe3+ is the last move
56 Rules / Legal position (Yes or no): A 1) No: before the last move Black was in check 2) Yes: b7xc8R+ is last move 3) No: before the last move White was in check 4) Yes: Rc6-c8+ is the last move 5) No: Black doesn’t have a last move 6) Yes: Kg2-h2 is last move 7) No: g2-g4 must be the last move, but how the bishop came on h1? 8) Yes: 4 (5) promotions to a queen 9) No: two white bishops and 8 pawns 10) No: Black has a double pawn and White still has all his pieces. 11) Yes: a5 is the last move 12) No: The black bishop cannot give check on a6.