MESON Chess Problem Database

Problem Display
PID: 198119 (4b1K1/3R1p2/8/q3N1Pp/1p1nk3/5N1Q/2ppr3/7B w - - 0 1)

Jakab, Arpad

HM., Vasarnapi Ujsag, 1920

4b1K1/3R1p2/8/q3N1Pp/1p1nk3/5N1Q/2ppr3/7B

#2

7 + 10

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Re3
      • 2.Rxd4#
  • Tries
    • 1.Qg4+?
      • 1...Ke3
        • 2.Qxd4#
      • 1...hxg4!
    • 1.Qh4+?
      • 1...Ke3
        • 2.Qxd4#
      • 1...Kf5!
  • Keys
    • 1.Sd3!
      • threat
        • 2.Sxd2#
      • 1...Qxg5+
        • 2.Sxg5#
      • 1...Kxd3
        • 2.Se5#
      • 1...Ke3
        • 2.Sxd4#
      • 1...Sxf3
        • 2.Qxf3#
      • 1...d1Q
        • 2.Sd2#
      • 1...d1S
        • 2.Sd2#
      • 1...d1B
        • 2.Sd2#
      • 1...d1R
        • 2.Sd2#
      • 1...Re3
        • 2.Rxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • R(c);SBLOCK::R1(F),XS(e)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(f);OGATE,P-FLIGHT::QAB1(C),XS(e)
      • Refutation
        • P(h);XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(f);OGATE,P-FLIGHT::QAB1(C),XS(e)
      • Refutation
        • K(f);S_FLIGHT
  • Actual
    • S(D);
    • Threat
      • B(A)+S(B),DCHECK,XP(b)
    • Vars
      • Q(g);CHECK,XP(E)::B(A)+S(B),DCHECK,XQ(g)
      • K(f);P_SPINS(e),S_FLIGHT,XS(D)::QAR(C)+S(B),DCHECK
      • K(f);P-FLIGHT::QAR(C)+S(B),XS(e)
      • S(e);OGATE,P_SPINS(e),XS(B)::QAB1(C),XS(e)
      • P(b);::B(A)+S(B),DCHECK
      • R(c);SBLOCK::R1(F),XS(e)
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