One way to etch your name into chess problem history is to invent your own theme. Walter Grimshaw (18321890) did just that. A Grimshaw interference is a mutual interference by two line pieces that play to the square where the lines intersects. A Grimshaw interference occurs be between a pawn and bishop or more commonly a rook and bishop. We begin with a simple example that illustrates the idea perfectly.
Here is an economical example by the German miniaturist. The key 1.Qa2 threatens 2.Qg8 and black can defend by blocking the wQ's path at d5. However, the bB and bR interfere with each other on this square giving the Grimshaw interference. 1...Bd5 2.Qa3 1...Rd5 2.Qa8 
Now we have perfection on a chess board. This is probably one of the most famous chess problems ever composed. We have a triple Grimshaw: 3 pairs of interferences between different line moving pieces. The problem is a complete block and the waiting key 1.Bb3 holds the block. There are Grimshaws on the squares b7, f6, and g7.
Another Loshinski masterpiece. The wR on f1 is out of play and signals that it may be the key piece. The key 1.Rb1 makes the nice line closing threat of 2.d4 by guarding the wS on b4. Black can defend on b2 by closing the line of guard. This leads to the first Grimshaw:
1...Bb2 2.Qf2 1...Rb2 2.Qxc3 Black can also close the 4th rank at g4 leading to the second Grimshaw: 1...Bg4 2.Bg1 1...Rg4 2.Se6 Finally, Black can block the wB's guard on c4 by cutting the line at e6: 1...Be6 2.Bd6 1...Re6 2.Sd7 A wonderful problem. My favorite part is how the composer worked in the Grimshaw defenses to defeat the threat. 
A beautiful changed double Grimshaw that won first prize in The Problemist. The waiting try 1.e5? () yields the play: 1...Bc7 2.Qc8 1...Rc7 2.Qd8 1...Bf7 2.Re7 1...Rf7 2.e6 but falls to 1...Be6! The key 1.Qe5 changes all of the Grimshaw mates 1...Bc7 2.Bc8 1...Rc7 2.Rd8 1...Bf7 2.Qe7 1...Rf7 2.Qe6 
A clear rendering of a white Grimshaw. The try 1.Bc3? threatens 2.Qa2 but is defeated by 1...Se5 because the wB closed the wRs guard on c6 hence 2.Rxe5 will not work. Likewise the try 1.Rc3? also threatening 2.Qa2 is defeated by 1...Rc7 because the wR closed the wB's line to d4 hence 2.Sxc7 will not work. What remains is 1.Rc4 making a different threat 2.Sc3. 
Here's something new. The problem is a helpmate duplex meaning that it has two solutions: one which is a normal helpmate with Black moving first and cooperating with White to mate and second solution in which White moves first and cooperates with Black to mate. Here we have a concept called Black/White Correspondence in the sense that they mimic each other. In the two wellmatched solutions there is a Grimshaw between the bR and a wB! Here are the solutions: B: 1.Rd5 Bf8 2.Ke6 Rd6 W: 1.Bd5 Rc1 2. Kd4 Bc4 
Moen, Kabe HarmonieAktiv 2016

Here is my only problem (so far) that contains a Grimshaw interference. The Grimshaw is not the point of the problem rather it happens in the byplay. See if you can find the three tries  moves that are foiled by a single black defense. I'll post the solution after it has been published. 