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Petrov's Defence, Marshall Trap
This document covers the Marshall trap
SteveB
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8,2,4,16,32,4,2,8,1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,129,129,129,129,129,129,129,129,136,130,132,144,160,132,130,136||The Marshall Trap is a chess opening trap in Petrov's Defense named after Frank Marshall, who was the U.S. Chess Champion from 1909–1936, and was one of the world's strongest chess players in the early part of the 20th century.||8,2,4,16,32,4,2,8,1,1,1,1,0,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,129,0,0,0,0,0,0,0,0,0,0,0,129,129,129,129,0,129,129,129,136,130,132,144,160,132,130,136|6,4,1,0,aimage.png,B,4,4,1,0,blank.png,B,1,4,4,0,yellow_overlay.png,0,3,4,4,0,yellow_overlay.png,0|The trap begins with Black playing Petrov's Defense. Petrov's Defense (also called Petroff's Defense, Russian Game and Russian Defense) is a chess opening characterized by the following moves: 1. e4 e5||8,2,4,16,32,4,0,8,1,1,1,1,0,1,1,1,0,0,0,0,0,2,0,0,0,0,0,0,1,0,0,0,0,0,0,0,129,0,0,0,0,0,0,0,0,130,0,0,129,129,129,129,0,129,129,129,136,130,132,144,160,132,0,136|7,6,1,0,aimage.png,B,5,5,1,0,blank.png,B,0,6,4,0,yellow_overlay.png,0,2,5,4,0,yellow_overlay.png,0| 2. Nf3 Nf6 Though this symmetrical response has a long history, it was first popularized by Alexander Petrov, a Russian chess player of the mid-19th century, this opening is called the Russian Game in some countries.||8,2,4,16,32,4,0,8,1,1,1,1,0,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,2,0,0,0,0,0,0,129,0,130,0,0,129,129,129,0,0,129,129,129,136,130,132,144,160,132,0,136|6,3,1,0,aimage.png,B,5,3,1,0,blank.png,B,4,4,4,0,yellow_overlay.png,0,2,5,4,0,yellow_overlay.png,0,4,4,0,0,x_red.png,0|3. Nxe5 d6 This causes the white knight to retreat.||8,2,4,16,32,4,0,8,1,1,1,1,0,1,1,1,0,0,0,0,0,2,0,0,0,0,0,0,130,0,0,0,0,0,0,0,0,0,0,0,0,0,0,129,0,0,0,0,129,129,129,0,0,129,129,129,136,130,132,144,160,132,0,136|5,5,1,0,aimage.png,B,3,4,1,0,blank.png,B,3,4,0,0,attackcross.png,0,4,4,4,0,yellow_overlay.png,0,2,5,4,0,yellow_overlay.png,0|4. Nf3 Nxe4||8,2,4,16,32,4,0,8,1,1,1,0,0,1,1,1,0,0,0,0,0,2,0,0,0,0,0,1,130,0,0,0,0,0,0,129,0,0,0,0,0,0,0,0,0,0,0,0,129,129,129,0,0,129,129,129,136,130,132,144,160,132,0,136|5,3,1,0,aimage.png,B,4,3,1,0,blank.png,B,1,3,4,0,yellow_overlay.png,0,3,3,4,0,yellow_overlay.png,0|5. d4 d5||8,2,4,16,32,0,0,8,1,1,1,0,0,1,1,1,0,0,0,4,0,2,0,0,0,0,0,1,130,0,0,0,0,0,0,129,0,0,0,0,0,0,0,132,0,0,0,0,129,129,129,0,0,129,129,129,136,130,132,144,160,0,0,136|7,5,1,0,aimage.png,B,5,3,1,0,blank.png,B,0,5,4,0,yellow_overlay.png,0,2,3,4,0,yellow_overlay.png,0|6. Bd3 Bd6||8,2,4,16,0,8,32,0,1,1,1,0,0,1,1,1,0,0,0,4,0,2,0,0,0,0,0,1,130,0,0,0,0,0,0,129,0,0,0,0,0,0,0,132,0,0,0,0,129,129,129,0,0,129,129,129,136,130,132,144,0,136,160,0|7,4,1,0,aimage.png,B,7,6,1,0,blank.png,B,0,4,4,0,yellow_overlay.png,0,0,6,4,0,yellow_overlay.png,0|7. 0-0 0-0||8,2,4,16,0,8,32,0,1,1,0,0,0,1,1,1,0,0,0,4,0,2,0,0,0,0,1,1,130,0,132,0,0,0,0,129,0,0,0,0,0,0,0,132,0,0,0,0,129,129,129,0,0,129,129,129,136,130,0,144,0,136,160,0|7,2,1,0,aimage.png,B,3,6,1,0,blank.png,B,3,2,4,0,yellow_overlay.png,0,1,2,4,0,yellow_overlay.png,0|8. c4 Bg4||8,2,4,16,0,8,32,0,1,1,0,0,0,1,1,1,0,0,0,4,0,2,0,0,0,0,0,1,130,0,132,0,0,0,0,1,0,129,0,0,0,0,0,132,0,0,0,0,129,129,129,0,0,0,129,129,136,130,0,144,0,136,160,0|6,5,1,0,aimage.png,B,4,5,1,0,blank.png,B,3,2,4,0,yellow_overlay.png,0,4,3,4,0,yellow_overlay.png,0,4,3,0,0,x_red.png,0|9. cxd5 f5||8,2,4,16,8,0,32,0,1,1,0,0,0,1,1,1,0,0,0,4,0,2,0,0,0,0,0,1,130,0,132,0,0,0,0,1,0,129,0,0,0,0,0,132,0,0,0,0,129,129,129,0,0,0,129,129,136,130,0,144,0,136,160,0|0,5,1,0,aimage.png,B,0,4,1,0,blank.png,B|10. Re1? White should play 10.Nc3 instead.||8,2,4,16,8,0,32,0,1,1,0,0,0,1,1,132,0,0,0,4,0,2,0,0,0,0,0,1,130,0,132,0,0,0,0,1,0,129,0,0,0,0,0,0,0,0,0,0,129,129,129,0,0,0,129,129,136,130,0,144,0,136,160,0|5,3,1,0,aimage.png,B,1,7,1,0,blank.png,B,1,7,0,0,attackcross.png,0,0,6,1,0,kingattack.png,0|10... Bxh2+! White might not have expected that move.||8,2,4,16,8,0,0,0,1,1,0,0,0,130,1,32,0,0,0,4,0,2,0,0,0,0,0,1,0,0,132,0,0,0,0,1,0,129,0,0,0,0,0,0,0,0,0,0,129,129,129,0,0,0,129,129,136,130,0,144,0,136,160,0|3,4,1,0,aimage.png,B,1,5,1,0,blank.png,B,1,5,0,0,attackcross.png,0,0,6,4,0,yellow_overlay.png,0,1,7,4,0,yellow_overlay.png,0,1,7,0,0,x_red.png,0|11. Kxh2 Nxf2 Black forks the white queen and bishop, the queen must move.||8,2,4,0,8,0,0,0,1,1,0,0,16,0,1,32,0,0,0,130,0,2,0,0,0,0,0,1,0,0,132,0,0,0,0,1,0,129,0,0,0,0,0,0,0,0,0,0,129,129,129,0,0,0,129,129,136,130,0,144,0,136,160,0|1,5,1,0,aimage.png,B,2,3,1,0,blank.png,B,2,3,0,0,attackcross.png,0,0,3,4,0,yellow_overlay.png,0,1,4,4,0,yellow_overlay.png,0|12. Qe2 Nxd3||8,2,4,0,8,0,0,0,1,1,0,0,0,0,1,32,0,0,0,16,0,132,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,129,0,0,0,0,0,0,0,0,0,0,129,129,129,0,0,0,129,129,136,130,0,144,0,136,160,0|3,6,1,0,aimage.png,B,2,5,1,0,blank.png,B,2,5,0,0,attackcross.png,0,1,4,4,0,yellow_overlay.png,0,2,3,4,0,yellow_overlay.png,0,2,3,0,0,x_red.png,0|13. Qxd3 Bxf3||8,2,4,0,8,0,0,0,1,1,0,0,0,0,1,32,0,0,0,0,0,16,0,0,0,0,0,1,0,0,0,144,0,0,0,1,0,129,0,0,0,0,0,0,0,0,0,0,129,129,129,0,0,0,129,129,136,130,0,0,0,136,160,0|4,6,1,0,aimage.png,B,3,7,1,0,blank.png,B,1,7,1,0,kingattack.png,0,2,3,4,0,yellow_overlay.png,0,2,5,4,0,yellow_overlay.png,0,2,5,0,0,x_red.png,0|14. Qxf3 Qh4+||8,2,4,0,8,0,32,0,1,1,0,0,0,0,1,0,0,0,0,0,0,16,0,0,0,0,0,1,0,0,0,144,0,0,0,1,0,129,0,0,0,0,0,0,0,0,0,0,129,129,129,0,0,0,129,129,136,130,0,0,0,136,160,0|1,7,1,0,aimage.png,B,0,6,1,0,blank.png,B,0,4,2,0,targetattack.png,0|Followed by Qxe1 winning the e1-rook. Black has a winning material advantage.|7,3,4,0,blue|8,2,4,0,144,0,32,0,1,1,0,0,0,0,1,0,0,0,0,0,0,16,0,0,0,0,0,1,0,0,0,0,0,0,0,1,0,129,0,0,0,0,0,0,0,0,0,0,129,129,129,0,0,0,129,129,136,130,0,0,0,136,160,0|3,7,1,0,aimage.png,B,0,4,1,0,blank.png,B,0,4,0,0,attackcross.png,0,0,6,1,0,kingattack.png,0|White is at a disadvantage now.||
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