Place the chicken and enough water to cover in a medium saucepan over high heat until water just begins to bubble. Reduce heat, cover, and poach 10 minutes or until just cooked.
Transfer the chicken to a bowl and let cool.
While chicken cooks, combine yogurt, mayonnaise, lemon juice, chutney, curry powder, and ginger in a large bowl.
Chop chicken and add to yogurt mixture.
Add celery, grapes, salt, and pepper. Toss to coat evenly. Divide spinach among 4 plates; top with chicken salad and pecans.