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CSE143 4-Queens Trace
explore col 1
1--place, explore col 2
1
2
3--place, explore col 3
1
2
3
4
4--place, explore col 3
1
2--place, explore col 4
1
2
3
4
3
4
2--place, explore col 2
1
2
3
4--place, explore col 3
1--place, explore col 4
1
2
3--place, explore col 5
solution!
4
2
3
4
3--place, explore col 2
1--place, explore col 3
1
2
3
4
1
2--place, explore col 5
solution!
3
4
2
3
4
4--place, explore col 2
1--place, explore col 3
1
2
3--place, explore col 4
1
2
3
4
4
2--place, explore col 3
1
2
3
4
3
4
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