# Chess Opening Theory/1. e3/1...e5/2. e4

King's Isa Reverse Opening
 a b c d e f g h 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 a b c d e f g h
Position in Forsyth-Edwards Notation (FEN)
Moves: 1. e3 e5 2. e4
ECO code: A00
Parent: Van 't Kruijs Opening

## 1. e3 e5 2. e4 - King's Isa Reverse Opening

An irregular opening, considered somewhat passive. Play may transpose to lines of the Chess/Reverse Petrov Defense (Nf6–Nf3), Chess/Reverse Englund Gambit (e4–d5), or reversed Rousseau Gambit (Nf6,Nc3-Bc5,f4).

The King's Isa Reverse Opening is not popular. According to ChessBase, it ranks eleventh in popularity out of the twenty possible first moves.

After Van't Kruijs Opening 1.e3 e5, White play 2.e4!? , therefore making it a truly reversed Double King's Pawn Opening (or Open Game). This is often used when White has much knowledge of the opening when playing as Black. Therefore, this can be used to ensnare a few opponents into traps. However, since this gives the first move advantage to Black straight away, this is not recommended. Similarly, 1.e3 f5 2.e4 goes to a reversed From's Gambit, where White is practically playing as Black.

## Statistics

Not enough data as opening is rarely played.

## Theory table

For explanation of theory tables, see theory table and for notation, see algebraic notation..

## Theory table

1. e3-e5
2. e4
 2 3 4 5 6 7 8 9 Nf6 Nc3 Bc5 Nd5 Nxd5 exd5 c6 Nf3 0-0 d4 exd4 Nxd4 cxd5 c3 Nc6 Nf6 Nc3 Bc5 f4 d5 exd5 Nxd5 Nf3 Nxf4 d4 exd4 Bxf4 dxc4 Qxd8 Kxd8 Nf6 Nf3 Nxe4 Nc3 Nxc3 dxc3 Nf6 Nc3 Bb4 f4 Nc6 fxe5 Nxe5 Nf3 Nf6 Nc3 Bc5 Bc4 0-0 Nf3 Bc4 Nf3 Nf6 Nc3