MESON Chess Problem Database

Problem Display
PID: 55034 (1qNBr1B1/8/5pn1/2Q1Pk2/2R2pn1/3b1NPK/2p1RpP1/2b5 w - - 0 1)

Montgomerie, John

The Observer, 1937

(First published on Sun May 23 1937)

1qNBr1B1/8/5pn1/2Q1Pk2/2R2pn1/3b1NPK/2p1RpP1/2b5

#2

11 + 11

4640 Chess Wizardry: The New ABC of Chess Problems 1996
5454 Near Snap 2007
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe5
      • 2.Sd6#
    • 1...Qd6
      • 2.Sxd6#
    • 1...Qa7
      • 2.Sd6#
    • 1...Qb1
      • 2.Sd6#
    • 1...Qb2
      • 2.Sd6#
    • 1...Qb3
      • 2.Sd6#
    • 1...Qb4
      • 2.Sd6#
    • 1...Qb5
      • 2.Sd6#
    • 1...Qb7
      • 2.Sd6#
    • 1...Qa8
      • 2.Sd6#
    • 1...S4xe5
      • 2.g4#
    • 1...fxe5
      • 2.Sd4#
  • Tries
    • 1.e6+?
      • 1...Qe5
        • 2.Sd6#
      • 1...S4e5
        • 2.g4#
      • 1...S6e5!
  • Keys
    • 1.Qd5!
      • threat
        • 2.Qxd3#
      • 1...Qxe5
        • 2.Sd6#
      • 1...Rxe5
        • 2.Be6#
      • 1...Rxd8
        • 2.Be6#
        • 2.Qe6#
      • 1...Rxg8
        • 2.Qd7#
      • 1...Bxe2
        • 2.Qe4#
      • 1...Bxc4
        • 2.Qe4#
      • 1...S4xe5
        • 2.g4#
      • 1...S6xe5
        • 2.Bh7#
      • 1...fxe5
        • 2.Sd4#
      • 1...Qd6
        • 2.Sxd6#
      • 1...Qb3
        • 2.Sd6#
      • 1...Qb7
        • 2.Sd6#
      • 1...Qa8
        • 2.Sd6#
      • 1...Be4
        • 2.Qxe4#

Anticipated by 44466(1929)

This anticipates 76724(1942)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 5
  • Sets
    • Q(j);N_GUARD,P_SPINQ(j),XP(H)::S(I)
    • Q(j);N_GUARD::S(I),XQ(j)
    • Q(j);N_GUARD::S(I)
    • S(f);OGATE,P_SPINS(f),XP(H)::P(D)
    • P(h);P_SPINP(h),XP(H)::S(C)
  • Tries
    • Try
      • P(H);CHECK
      • Vars
        • Q(j);P_SPINQ(j)::S(I)
        • S(f);OGATE,P_SPINS(f)::P(D)
      • Refutation
        • S(i);P_SPINS(i)
  • Actual
    • Q(G);
    • Threat
      • QAB(G),XB(d)
    • Vars
      • Q(j);N_GUARD,P_SPINQ(j),XP(H)::S(I)
      • R(k);N_GUARD,P_SPINR(k),XP(H)::B(K)
      • R(k);N_GUARD,XB(K)::QAB(G)
      • B(d);N_GUARD,XR(A)::QAB1(G)
      • B(d);N_GUARD,XR(F)::QAB1(G)
      • S(f);OGATE,P_SPINS(f),XP(H)::P(D)
      • S(i);OGATEB,P_SPINS(i),XP(H)::B(K)
      • P(h);P_SPINP(h),XP(H)::S(C)
      • Q(j);N_GUARD::S(I),XQ(j)
      • Q(j);N_GUARD::S(I)
      • B(d);N_GUARD::QAB1(G),XB(d)
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