MESON Chess Problem Database

Problem Display
PID: 256538 (8/1KNpp3/P1pPPp2/2k2p2/Q2R4/4p3/2nn3B/8 w - - 0 1)

Barnes, Barry Peter

The Problemist Supplement, 2021

8/1KNpp3/P1pPPp2/2k2p2/Q2R4/4p3/2nn3B/8

#2

8 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Sa1
      • 2.Qb4#
    • 1...Se1
      • 2.Qb4#
    • 1...Sa3
      • 2.Qb4#
    • 1...Sb4
      • 2.Qxb4#
    • 1...Sb1
      • 2.Rc4#
      • 2.Qc4#
    • 1...Sf1
      • 2.Rc4#
      • 2.Qc4#
    • 1...Sb3
      • 2.Rc4#
      • 2.Qc4#
    • 1...Sf3
      • 2.Rc4#
      • 2.Qc4#
    • 1...Sc4
      • 2.Rxc4#
      • 2.Qxc4#
    • 1...Se4
      • 2.Rc4#
      • 2.Qc4#
    • 1...dxe6
      • 2.Sxe6#
    • 1...exd6
      • 2.Bxd6#
  • Tries
    • 1.Be5?
      • threat
        • 2.Qa5#
      • 1...Sxd4
        • 2.Qxd4#
      • 1...Sa3
        • 2.Qxa3#
        • 2.Qb4#
      • 1...Sb3
        • 2.Rc4#
        • 2.Qc4#
      • 1...Sc4
        • 2.Rxc4#
        • 2.Qxc4#
      • 1...fxe5!
    • 1.Qxc2+?
      • 1...Sc4
        • 2.Rxc4#
        • 2.Qxc4#
      • 1...Kxd4!
    • 1.a7?
      • threat
        • 2.Sa6#
      • 1...Sb4
        • 2.Qxb4#
      • 1...Sc4
        • 2.Rxc4#
        • 2.Qxc4#
      • 1...Sxd4!
    • 1.exd7?
      • threat
        • 2.Se6#
      • 1...e6
        • 2.Sxe6#
      • 1...Sxd4!
  • Keys
    • 1.Rf4!
      • threat
        • 2.Rxf5#
      • 1...Kxd6
        • 2.Rxf5#
      • 1...dxe6
        • 2.Qxc6#
      • 1...exd6
        • 2.Qa5#
      • 1...Sb4
        • 2.Qxb4#
      • 1...Sd4
        • 2.Qxd4#
      • 1...Sf3
        • 2.Rc4#
      • 1...Sc4
        • 2.Rxc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • S(a);N_GUARD::QAB1(B)
    • S(a);N_GUARD::QAB1(B),XS(a)
    • P(h);XP(F)::S(H),XP(h)
    • P(i);OGATE,XP(E)::B(A),XP(i)
  • Tries
    • Try
      • B(A);
      • Threat
        • QAR2(B)
      • Vars
        • S(a);OGATE,XR(C)::QAB1(B),XS(a)
      • Refutation
        • P(g);XB(A)
    • Try
      • Q(B);CHECK,XS(a)
      • Refutation
        • K(d);S_FLIGHT,XR(C)
    • Try
      • P(D);
      • Threat
        • S(H)
      • Vars
        • S(a);N_GUARD::QAB1(B),XS(a)
      • Refutation
        • S(a);XR(C)
    • Try
      • P(F);XP(h)
      • Threat
        • S(H)
      • Vars
        • P(i);::S(H),XP(i)
      • Refutation
        • S(a);XR(C)
  • Actual
    • R(C);
    • Threat
      • R(C),XP(e)
    • Vars
      • K(d);S_FLIGHT,XP(E)::B(A)+R(C),XP(e)
      • P(h);N_GUARD,XP(F)::QAR1(B),XP(f)
      • P(i);SBLOCK,XP(E)::QAR2(B)
      • S(a);N_GUARD::QAB1(B),XS(a)
      • S(b);N_GUARD::R1(C)
      • S(b);N_GUARD::R1(C),XS(b)
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