That's when people throw gold coins or bandy words like immortal and evergreen.

From the starting position, you've just got to play 15. Kd2 offering the a1 rook. Having sacrificed one rook, the second one will only pine for its mate if you don't make it a buy-one get one free offer.

Incidentally, after 15. Kd2 we have a really interesting position ...

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Black controls all four corners of the board. That would be a fantastic achievement if we were playing Othello, but in chess it turns out to be as meaningful as the "trophies" that my ipad and PS3 keep giving me.

Losing outright is 9...Bd6?, as Black's last chance to put up meaningful resistance is with the <wild and crazy> 9...Be7!? (diagram below)

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Fritz indicates White secures a one to two pawn advantage after:

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dash a slice bail hile exchange up rooks at dues in catch hunt is on ar nosh in aim f6 light daccord horde hammer f7 an dangle a f8 like a rose g5 bishop eg a roof top finish bishop more delicate poise f6 traps down black monarch eg win h6 staves off immediate pressures and could in a stroke of luck save the day band over bug jog on down g5 the price is right juggle bounce heavens holder heaves having as he effective bishop heffa-lump higgle piggle of options up ride queen a lion h1 and a1 house twins right royal coup yet gets a mate in between hogfest hassle won hanker mitigate ala green gauge:

hive mind feel hoof e5 off he goes up in switch inch a feint huffle stride rich efface up man horded in da house safe licks ok hubbles around scope glib do a kind frame ever to vow danger ha fade in hoist line g5 liege ar flood d8 ah friend advance his e4 aims h1 pernicious a1 good for light having kandy kane stripe f7 in ever d5 a dash around the houses h1 plus right ruck a1 run down over ha damage done in focus at back be step up to dink as again for among bakes a noodle in shape up ride a blade 15.Kd2 focal point a1 info ok line low good light:

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a dilemma re establish add well e8 a dingle f7

White to play (15.?) "Difficult"

Our king is in check, so that's the first order of business. Black has just captured our rook on h1 (apparently), so one option would be to sacrifice the other rook -- a classic theme, the double-rook sacrifice -- in order to gain a tempo to launch an attack on the Black king.

15. Kd2!

This is easily the best move, and not too hard to find as the other rook is not needed. Note that Black would be able to defend if White had played 15. Bf1(?) Qe4+ 16. Be2 h6!.

15...Qxa1

Or 15...Qxh2 16. Nxc6+ dxc6 17. Bxe7+ Kd7 18. Bf6+ Be7 19. Qxe7#. This also works now in the main line, but there is an even shorter mate which I found first that is flashier. I found it because of all the minor pieces near Black's king, and the position was similar to another tactics position I remembered.

16. Qe8+! Kxe8 (or 16...Rxe8 17. Nf7#) 17. Nf6+ Kf8 (or 17...Kd8 18. Nf7#) 18. Bh6#.

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