MESON Chess Problem Database

Problem Display
PID: 55135 (8/8/6b1/7Q/2p3N1/8/3RpRB1/2K1kq2 w - - 0 1)

Prins, Hendrik

4th HM., Troll, 1991

8/8/6b1/7Q/2p3N1/8/3RpRB1/2K1kq2

#2

6 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg2
      • 2.Rdxe2#
    • 1...Qg1
      • 2.Rdxe2#
      • 2.Rfxe2#
    • 1...Qh1
      • 2.Rdxe2#
      • 2.Rfxe2#
      • 2.Qxh1#
  • Tries
    • 1.Bxf1?
      • threat
        • 2.Rdxe2#
      • 1...exf1Q
        • 2.Rd1#
      • 1...exf1S
        • 2.Rd1#
        • 2.Rde2#
        • 2.Rfe2#
      • 1...exf1B
        • 2.Rd1#
      • 1...exf1R
        • 2.Rd1#
        • 2.Rde2#
        • 2.Rfe2#
      • 1...Bd3!
    • 1.Qa5?
      • threat
        • 2.Rd1#
        • 2.Rdxe2#
      • 1...Qxf2
        • 2.Rd1#
      • 1...c3!
    • 1.Qe5?
      • threat
        • 2.Rd1#
        • 2.Rxf1#
      • 1...Qxg2
        • 2.Rd1#
        • 2.Rdxe2#
        • 2.Qxe2#
      • 1...Qxf2
        • 2.Rd1#
      • 1...Qg1
        • 2.Rd1#
        • 2.Rdxe2#
        • 2.Rfxe2#
        • 2.Qxe2#
      • 1...Qh1
        • 2.Rd1#
        • 2.Rdxe2#
        • 2.Rfxe2#
        • 2.Qxe2#
      • 1...Bc2
        • 2.Rxf1#
      • 1...Be4!
  • Keys
    • 1.Qh4!
      • threat
        • 2.Rxf1#
        • 2.Rfxe2#
      • 1...Qxg2
        • 2.Rdxe2#
      • 1...Qxf2
        • 2.Qxf2#
      • 1...Qg1
        • 2.Rdxe2#
        • 2.Rf1#
        • 2.Rfxe2#
      • 1...Qh1
        • 2.Rdxe2#
        • 2.Rf1#
        • 2.Rfxe2#
        • 2.Qxh1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • Q(b);N_GUARD,XB(D)::R1(B),XP(c)
  • Tries
    • Try
      • B(D);XQ(b)
      • Threat
        • R1(B),XP(c)
      • Vars
        • P(c);N_GUARD,XB(D)::R1(B)
      • Refutation
        • B(e);
    • Try
      • Q(F);
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);XR(C)::QAB(F)+R(B),DCHECK
      • Refutation
        • P(d);
    • Try
      • Q(F);P_PINP(c)
      • Threat
        • DUALS(2)
      • Vars
        • Q(b);XR(C)::R1(B)
        • B(e);::R1(C),XQ(b)
      • Refutation
        • B(e);N_SPINP(c)
  • Actual
    • Q(F);
    • Threat
      • DUALS(2)
    • Vars
      • Q(b);N_GUARD,XB(D)::R1(B),XP(c)
      • Q(b);OGATE,P_SPINQ(b),XR(C)::QAB1(F),XQ(b)
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