not possible due to pin) 1... Bb7 2. Qd7# (2... Rxd7 not possible) 1... Bc7 2. Qd7# (2... Rxd7 not possible) 1... Rb6 2. Nd8# (2... Bxd8 not possible) 1... Rc7 2. Nd8# (2... Bxd8 not possible) 1... e3 2. Bf5# 1... f3 2. Qxh6# 1... h5 2. Ng5# Grimshaws involving pawns The pieces involved in Grimshaws are usually rook and bishop, as in the previous example, although Grimshaws involving pawns are also seen, as in this mate in two example by Frank Janet (published in the St.Louis Globe Democrat, 1916): The key is 1.Qd7, threatening 2.Qf5#. As in the previous example, Black can defend by cutting White's queen off from its intended destination square, but two of these defences have fatal flaws in that they interfere with other pieces: 1...Be6 interferes with the pawn on e7, allowing 2.Qxc7# (2...e5 would be possible were the bishop not on e6) and 1...e6 interferes with the bishop, allowing 2.Qxa4# (2...Bc4 would be possible were the pawn not on e6). It is this mutual interference between bishop and pawn on e6 which constitutes the pawn Grimshaw. There are several other non-thematic black defences in this problem — see below for them all. 1.Qd7 (threatening 2.Qf5#) 1...Be6 2.Qxc7# 1...e6 2.Qxa4# 1...Ne6 2.Nd5# 1...Ra5 2.Qd4# 1...Nxe3 2.fxe3# 1...Ng3 2.fxg3# Multiple Grimshaws Sometimes, multiple Grimshaws can be combined in one problem. Here are two examples by Lev Ilych Loshinsky each with three Grimshaws. First example This was first published in L'Italia Scacchistica, 1930. It is a mate in two. The key is 1.Rb1, with the threat 2.d4#. Each of Black's defences produces a Grimshaw interference which stops him from capturing White's mating piece. Black's defences, with White's replies, are: 1...Re6 2.Nd7# (2...Bxd7 not possible) 1...Be6 2.Bd6# (2...Rxd6 not possible) 1...Rg4 2.Ne6# (2...Bxe6 not possible) 1...Bg4 2.Bg1# (2...Rxg1 not possible) 1...Rb2 2.Qxc3# (2...Bxc3 not possible) 1...Bb2 2.Qf2# (2...Rxf2 not possible) There is one other black defence: 1...Rd6 leading to the simple recapture 2.Bxd6# (this is essentially the same mate as that which follows 1...Be6). Second example This second Loshinsky example, also a mate in two, is from Tijdschrift v.d. Nederlandse Schaakbond, 1930, and is one of the most famous of all chess problems. It is a complete block (if White could pass his first move, then he could reply to every black move with a mate), and White's key, 1.Bb3, holds this block, making no threat, but