The jigsaw puzzle of the most primitive version of the middle of the next button is to calculate the first return to the accident the steps of the state. After each time you press, then backwards to go back (at least the number of steps).

9chess\9chess.pro
......\9chess.pro.user
......\algorithm.cpp
......\image.qrc
......\main.cpp
......\mainwindow.cpp
......\mainwindow.h
......\mainwindow.ui
......-build-desktop\iamges\0.png
....................\......\1.png
....................\......\2.png
....................\......\3.png
....................\......\4.png
....................\......\5.png
....................\......\6.png
....................\......\7.png
....................\......\8.png
....................\Makefile
....................\Makefile.Debug
....................\Makefile.Release
....................\release\9chess.exe
....................\.......\main.o
....................\.......\mainwindow.o
....................\.......\moc_mainwindow.cpp
....................\.......\moc_mainwindow.o
....................\.......\qrc_image.cpp
....................\.......\qrc_image.o
....................\ui_mainwindow.h
....................\debug
....................\iamges
....................\release
9chess
9chess-build-desktop

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