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) rnbqkbnr/pppp1ppp/8/4p3/4P3/8/PPPP1PPP/RNBQKBNR b
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
Chess/Blackburne Shilling Gambit	Nf6	Nc3 Bc5	Nd5 Nxd5	exd5 c6	Nf3 0-0	d4 exd4	Nxd4 cxd5	c3 Nc6
Chess Rousseau Gambit Reverse	Nf6	Nc3 Bc5	f4 d5	exd5 Nxd5	Nf3 Nxf4	d4 exd4	Bxf4 dxc4	Qxd8 Kxd8
Chess Stafford Gambit Reverse	Nf6	Nf3 Nxe4	Nc3 Nxc3	dxc3
Chess Jaenisch Gambit Reverse	Nf6	Nc3 Bb4	f4 Nc6	fxe5 Nxe5	Nf3
Chess Giuoco Piano Reverse	Nf6	Nc3 Bc5	Bc4 0-0	Nf3
Chess Two Knight's Defence Reverse	Bc4	Nf3 Nf6	Nc3

References

https://lichess.org/study/bOtkXznC

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