MESON Chess Problem Database

Problem Display
PID: 55569 (3R4/K2NN3/8/1pPBP2p/3k2qR/Q3ppB1/4p3/2n1r3 w - - 0 1)

Mansfield, Comins

1st HM., The Problemist, 1976/I

3R4/K2NN3/8/1pPBP2p/3k2qR/Q3ppB1/4p3/2n1r3

#2

10 + 9

4054 Complete Mansfield/III 1999

SOLUTION

  • SOUND
  • Sets
    • 1...Qe4
      • 2.Rxe4#
    • 1...Qf4
      • 2.Rxf4#
  • Tries
    • 1.Sf8?
      • threat
        • 2.Sf5#
        • 2.Sc6#
        • 2.Se6#
      • 1...Qf4
        • 2.Sc6#
      • 1...b4
        • 2.Se6#
      • 1...Sb3!
  • Keys
    • 1.Be4!
      • threat
        • 2.Qb4#
      • 1...Qxd7+
        • 2.Bb7#
      • 1...Kc4
        • 2.Sb6#
      • 1...Kxe4
        • 2.Sf6#
      • 1...Qxe4
        • 2.Sb6#
      • 1...Qe6
        • 2.Bf5#
      • 1...Qg8
        • 2.Bg6#
      • 1...Sa2
        • 2.Qd3#
      • 1...Sd3
        • 2.Qxd3#
      • 1...b4
        • 2.Qxb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 8
    • REMOVED MATES = 1
  • Sets
    • Q(g);OGATE::R1(C),XQ(g)
    • Q(g);OGATE::R(C),XQ(g)
  • Tries
    • Try
      • S(H);
      • Threat
        • DUALS(3)
      • Vars
        • Q(g);::S(I)
        • P(h);::S(H)
      • Refutation
        • S(a);
  • Actual
    • B(E);N_PINQ(g)
    • Threat
      • QAR2(A)
    • Vars
      • Q(g);CHECK,OGATEB,P_SPINQ(g),XS(H)::R(C)+B(E)
      • K(f);P-FLIGHT::S(H)
      • K(f);P-FLIGHT,P_SPINQ(g),XB(E)::S(H)
      • Q(g);N_GUARD,P_SPINQ(g),XB(E)::R(J)+S(H)
      • Q(g);OGATEB::R(C)+B(E)
      • S(a);N_GUARD::QAR1(A)
      • S(a);N_GUARD::QAR1(A),XS(a)
      • P(h);::QAR2(A),XP(h)
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