MESON Chess Problem Database

Problem Display
PID: 32429 (nQ6/1pq2N1B/1pb5/1P1P2p1/R2K1kr1/p1P2r1p/5B1P/2b1NR2 w - - 0 1)

Harper, AM

De Problemist, 1928

nQ6/1pq2N1B/1pb5/1P1P2p1/R2K1kr1/p1P2r1p/5B1P/2b1NR2

#2

12 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Qe5+
      • 2.Qxe5#
    • 1...Qd6
      • 2.Qxd6#
    • 1...Rxf2
      • 2.Kd3#
      • 2.Rxf2#
    • 1...Rxc3
      • 2.Kxc3#
      • 2.Be3#
      • 2.Bg3#
    • 1...Rd3+
      • 2.Kxd3#
    • 1...Re3
      • 2.Bxe3#
      • 2.Bg3#
    • 1...Rfg3
      • 2.Be3#
      • 2.Bxg3#
    • 1...Bb2
      • 2.Be3#
    • 1...Be3+
      • 2.Bxe3#
    • 1...Bxd5
      • 2.Kxd5#
  • Tries
    • 1.dxc6?
      • threat
        • 2.Kd5#
      • 1...Qe5+
        • 2.Qxe5#
      • 1...Qd6+
        • 2.Qxd6#
      • 1...Rd3+
        • 2.Kxd3#
      • 1...Be3+
        • 2.Bxe3#
      • 1...Rxf2
        • 2.Kd3#
        • 2.Rxf2#
      • 1...Rxc3
        • 2.Kxc3#
        • 2.Be3#
        • 2.Bg3#
      • 1...Re3
        • 2.Bxe3#
        • 2.Bg3#
      • 1...bxc6!
  • Keys
    • 1.Kc4!
      • threat
        • 2.Kb3#
      • 1...Rxc3+
        • 2.Kxc3#
      • 1...Bxb5+
        • 2.Kxb5#
      • 1...Bxd5+
        • 2.Kxd5#
      • 1...Rxf2
        • 2.Kd3#
      • 1...Rd3
        • 2.Kxd3#
      • 1...Re3
        • 2.Bg3#
      • 1...Be3
        • 2.Sd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • Q(k);CHECK,OGATE::QAB1(L),XQ(k)
    • Q(k);OGATE,P_PINP(I)::QAB(L),XQ(k)
    • R(c);CHECK::R(F)+K(G),XR(c)
    • B(a);N_GUARD,P_PINP(E)::B(C)
    • B(a);CHECK,N_GUARD::B(C),XB(a)
    • B(i);XP(I)::R(F)+K(G),XB(i)
  • Tries
    • Try
      • P(I);XB(i)
      • Threat
        • R(F)+K(G)
      • Vars
        • Q(k);CHECK,OGATE::QAB1(L),XQ(k)
        • Q(k);CHECK,OGATE::QAB(L),XQ(k)
        • R(c);CHECK::R(F)+K(G),XR(c)
        • B(a);CHECK,N_GUARD::B(C),XB(a)
      • Refutation
        • P(j);XP(I)
  • Actual
    • K(G);P-FLIGHT
    • Threat
      • R(F)+K(G)
    • Vars
      • R(c);CHECK,XP(E)::R(F)+K(G),XR(c)
      • B(i);CHECK,XP(H)::R(F)+K(G),XB(i)
      • B(i);CHECK,XP(I)::R(F)+K(G),XB(i)
      • R(c);P_SPINR(c),XB(C)::R(F)+K(G)
      • R(c);::R(F)+K(G),XR(c)
      • R(c);SBLOCK::R(B)+B(C),DCHECK
      • B(a);S_CUTR(c)::S(A)
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