MESON Chess Problem Database

Problem Display
PID: 201944 (qQ4r1/R4N1B/1p3pnb/5r2/4k3/3RNp2/2P2PP1/2B3K1 w - - 0 1)

Maclay, J Neil

The Observer, 1950

(First published on Sun Feb 12 1950)

qQ4r1/R4N1B/1p3pnb/5r2/4k3/3RNp2/2P2PP1/2B3K1

#2

11 + 9

15239 Valois Notebooks 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qb7
      • 2.Ra4#
    • 1...Qxb8
      • 2.Ra4#
    • 1...Rf4
      • 2.Re7#
    • 1...Sf4
      • 2.Bxf5#
    • 1...Sh4
      • 2.Re7#
    • 1...Se7
      • 2.Rxe7#
    • 1...Sf8
      • 2.Bxf5#
    • 1...Sh8
      • 2.Bxf5#
      • 2.Re7#
  • Tries
    • 1.Qb7+?
      • 1...Kf4
        • 2.Rd4#
        • 2.g3#
      • 1...Qxb7
        • 2.Ra4#
      • 1...Rd5!
    • 1.Qxa8+?
      • 1...Kf4
        • 2.Rd4#
        • 2.Ra4#
        • 2.Qxf3#
        • 2.g3#
      • 1...Rd5
        • 2.Ra4#
      • 1...Rxa8!
    • 1.gxf3+?
      • 1...Rxf3
        • 2.Re7#
      • 1...Kxf3!
  • Keys
    • 1.Sf1!
      • threat
        • 2.Sg3#
      • 1...Qxb8
        • 2.Ra4#
      • 1...Rg5
        • 2.Qf4#
      • 1...Bf4
        • 2.gxf3#
      • 1...Sf4
        • 2.Sd2#
      • 1...Sh4
        • 2.Re7#
      • 1...Se5
        • 2.Sd6#
      • 1...Se7
        • 2.Rxe7#
      • 1...Sf8
        • 2.Qxa8#
      • 1...Sh8
        • 2.Re7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • Q(h);N_GUARD::R(H)
    • Q(h);N_GUARD,XQ(K)::R(H)
    • R(c);N_GUARD,P_SPINS(f)::R(H)
    • S(f);OGATE,P_PINP(E),P_SPINR(c)::B(J),XR(c)
    • S(f);N_GUARD,P_PINP(E),P_SPINR(c)::R(H)
    • S(f);N_GUARD,P_PINP(E),P_SPINR(c)::R(H),XS(f)
  • Tries
    • Try
      • Q(K);CHECK
      • Vars
        • Q(h);XQ(K)::R(H)
      • Refutation
        • R(c);P_SPINR(c),P_SPINS(f)
    • Try
      • Q(K);CHECK,XQ(h)
      • Vars
        • R(c);P_SPINR(c),P_SPINS(f)::R(H)
      • Refutation
        • R(i);XQ(K)
    • Try
      • P(E);CHECK,XP(a)
      • Vars
        • R(c);P_SPINS(f),SBLOCK,XP(E)::R(H)
      • Refutation
        • K(b);S_FLIGHT,XP(E)
  • Actual
    • S(G);
    • Threat
      • S(G)
    • Vars
      • Q(h);N_GUARD,XQ(K)::R(H)
      • R(c);N_GUARD,P_PINP(E),P_SPINS(f),S_CUTB(g)::QAR1(K)
      • B(g);S_CUTR(c)::P(E),XP(a)
      • S(f);P_PINP(E),P_SPINR(c),S_CUTB(g)::S(G)
      • S(f);N_GUARD,P_PINP(E),P_SPINR(c)::R(H)
      • S(f);P_PINP(E),P_SPINR(c),SBLOCK::S(I)
      • S(f);N_GUARD,P_PINP(E),P_SPINR(c)::R(H),XS(f)
      • S(f);P_PINP(E),P_SPINR(c),S_CUTR(i)::QAB(K),XQ(h)
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