MESON Chess Problem Database

Problem Display
PID: 139900 (k4N2/2Kp4/1p2P1R1/1N1pQb2/2p5/1R4r1/5n2/5rbq w - - 0 1)

Darvall, RJ

The Problemist, 1938

k4N2/2Kp4/1p2P1R1/1N1pQb2/2p5/1R4r1/5n2/5rbq

#2

7 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qh2
      • 2.Qxd5#
    • 1...Qh3
      • 2.Qxd5#
    • 1...Qh4
      • 2.Qxd5#
    • 1...Qh5
      • 2.Qxd5#
    • 1...Qh6
      • 2.Qxd5#
    • 1...Qh7
      • 2.Qxd5#
    • 1...Qh8
      • 2.Qxd5#
    • 1...Ra1
      • 2.Qxa1#
    • 1...Rg2
      • 2.Ra3#
      • 2.Qxd5#
    • 1...Rf3
      • 2.Qxd5#
    • 1...Rg4
      • 2.Ra3#
    • 1...Rg5
      • 2.Ra3#
    • 1...Rxg6
      • 2.Ra3#
    • 1...Bd3
      • 2.Ra3#
    • 1...Sd1
      • 2.Qa1#
    • 1...Sd3
      • 2.Ra3#
    • 1...Se4
      • 2.Qxd5#
    • 1...c3
      • 2.Ra3#
  • Tries
    • 1.Qb2?
      • threat
        • 2.Qa3#
        • 2.Qa2#
      • 1...cxb3
        • 2.Qa3#
      • 1...Ra1
        • 2.Qxa1#
      • 1...Bb1
        • 2.Qa3#
      • 1...Rxb3!
  • Keys
    • 1.Sxd7!
      • threat
        • 2.Sxb6#
      • 1...Qh7
        • 2.Qxd5#
      • 1...Sd1
        • 2.Qa1#
      • 1...Sd3
        • 2.Ra3#
      • 1...Sh3
        • 2.Qh8#
      • 1...Se4
        • 2.Qxd5#
      • 1...Sg4
        • 2.Rg8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 13
  • Sets
    • Q(c);N_GUARD::QAB(C),XP(g)
    • Q(c);N_GUARD,SBLOCK::QAB(C),XP(g)
    • R(a);N_GUARD::QAB(C),XR(a)
    • R(e);S_CUTQ(c)::QAB(C),XP(g)
    • R(e);N_GUARD::R(A)
    • R(e);N_GUARD,XR(E)::R(A)
    • B(h);S_CUTR(e)::R(A)
    • S(d);S_CUTR(a)::QAB(C)
    • S(d);S_CUTR(e)::R(A)
    • S(d);S_CUTQ(c)::QAB(C),XP(g)
    • P(f);S_CUTR(e)::R(A)
  • Tries
    • Try
      • Q(C);
      • Threat
        • DUALS(2)
      • Vars
        • P(f);XR(A)::QAR(C)
        • R(a);N_GUARD::QAB(C),XR(a)
        • B(h);::QAR(C)
      • Refutation
        • R(e);XR(A)
  • Actual
    • S(G);XP(j)
    • Threat
      • S(G),XP(i)
    • Vars
      • Q(c);N_GUARD,P_PINS(G),SBLOCK::QAB(C),XP(g)
      • S(d);S_CUTR(a)::QAB(C)
      • S(d);S_CUTR(e)::R(A)
      • S(d);S_CUTQ(c)::QAB1(C)
      • S(d);S_CUTQ(c)::QAB(C),XP(g)
      • S(d);S_CUTR(e)::R(E)
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