MESON Chess Problem Database

Problem Display
PID: 250214 (K7/8/3R4/Q7/2B4B/4P1R1/4Pp2/1Nq2k2 w - - 0 1)

Grunfeld, Max

Tijdschrift vd NSB, 1927

K7/8/3R4/Q7/2B4B/4P1R1/4Pp2/1Nq2k2

#2

9 + 3

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qb2
      • 2.Rd1#
    • 1...Qa3
      • 2.Rd1#
    • 1...Qxe3
      • 2.Rd1#
    • 1...Qd1
      • 2.Rxd1#
  • Tries
    • 1.Sd2+?
      • 1...Ke1
        • 2.Rg1#
      • 1...Qxd2!
    • 1.Qd5?
      • threat
        • 2.Qh1#
      • 1...Ke1
        • 2.Rg1#
      • 1...Qxc4
        • 2.Qd1#
      • 1...Qa3+!
  • Keys
    • 1.Qa1!
      • 1...Qa3+
        • 2.Sxa3#
      • 1...Ke1
        • 2.Rg1#
      • 1...Qxe3
        • 2.Sd2#
        • 2.Rd1#
      • 1...Qxb1
        • 2.Qxb1#
      • 1...Qxc4
        • 2.Sc3#
      • 1...Qb2
        • 2.Sd2#
        • 2.Rd1#
      • 1...Qd2
        • 2.Sxd2#
      • 1...Qd1
        • 2.Rxd1#
      • 1...Qe1
        • 2.Sd2#
      • 1...Qc2
        • 2.Sd2#
      • 1...Qc3
        • 2.Sd2#
        • 2.Sxc3#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 2
  • Sets
    • Q(a);N_GUARD::R(H)
    • Q(a);N_GUARD,P_PINQ(G)::R(H)
    • Q(a);N_GUARD,XP(C)::R(H)
    • Q(a);N_GUARD::R(H),XQ(a)
  • Tries
    • Try
      • S(A);CHECK
      • Vars
        • K(b);N_GUARD,P-FLIGHT::R(D)
      • Refutation
        • Q(a);XS(A)
    • Try
      • Q(G);
      • Threat
        • QAR2(G)
      • Vars
        • K(b);N_GUARD,P-FLIGHT,S_CUTP(c),S_CUTP(c),S_CUTP(c),S_CUTP(c)::R(D)
        • Q(a);N_GUARD,XB(E)::QAR2(G)
      • Refutation
        • Q(a);CHECK
  • Actual
    • Q(G);
    • Vars
      • Q(a);CHECK::QAR(G)+S(A),XQ(a)
      • K(b);N_GUARD,P-FLIGHT,S_CUTP(c),S_CUTP(c),S_CUTP(c),S_CUTP(c)::R(D)
      • Q(a);OGATE,P_SPINQ(a),XS(A)::QAR(G),XQ(a)
      • Q(a);XB(E)::QAR(G)+S(A)
      • Q(a);::QAR(G)+S(A),DCHECK,XQ(a)
      • Q(a);N_GUARD::R(H),XQ(a)
      • Q(a);::S(A)
      • Q(a);::QAR(G)+S(A),DCHECK
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